Well Mr Beardsley beat me to it...
TL;DR warning for those who don't care... read on for my drunken analysis...
I think it comes down to the "snap" of the flipper is what the "feelings" people are experiencing and what I think is different. What do I mean by snap? That may take a minute... you can skip on down past the flip types here because most of us know that part already...
Flip Types
Ok a flipper has several modes by which it is used by a player... There is the rolling flip, the cradled flip, the cradled roll flip, the drop catch flip, the scoop it flip, the tap pass flip, the post pass flip, the tip it flip, the backhand flip, the Slap save flip, and finally the flip on the fly flip.
The rolling flip- ball rolls down inlane, player times his shot and flips.
The cradled flip- player releases ball from cradle, and immediately flips (extreme backhand) this sometimes does a post pass depending on machine.
The cradled roll flip, release the ball from cradle, let roll, then flip
The drop catch flip- time the flip to meet and counter the balls down field momentum resulting in a dead, catchable ball
The scoop it flip- player times flip to aid scooping the ball up the inlane
The Tap pass flip- slight flipper button press to momentarily tap the ball to the opposite flipper
The post pass flip- usually from a cradled position, flipper is immediately cycled to backhand the ball to the post and bounce it to opposite flipper, hopefully with little or no ball momentum
The tip it flip- this is similar to flip on the fly, but player is actually timing his flip so that the tip will be just in the ball path causing it to deflect but in no specific direction other than NOT SDTM
The backhand flip- a slow rolling ball is allowed to roll up an extended flipper which then is suddenly released and reflipped sending the ball to the opposite direction of normal flipper direction. Usually is preceded by a post pass that makes the ball roll up the opposite inlane and back down setting up the backhand shot
The slap save flip- similar to tip it except is accompanied with a hard flipper button cabinet slap. Meant to move the table causing a step in ball trajectory that helps "push" the ball in the direction of the flipper tip, causing it to deflect and save the ball.
And finally the flip on the fly flip- which is any shot where the ball meets the flipper AFTER the flipper has started moving. The ball and flipper meet at some point and results in a ball trajectory that can be calculated on the fly to send the ball in almost any direction.
OK So SNAP is what actually?
So where does "snap" fit in to all these different types of flips? I believe the "feeling" that is off is the difference between flipper acceleration with ball mass added versus an empty flipper, or the change in speed of the flipper differs depending of the closed mass system. It's either plunger, link, return spring, crank, shaft, flipper body and rubber, or all that plus the mass of the ball. When "unloaded" the flipper will accelerate (and change its position accordingly) depending on the force applied by the coil. This acceleration/speed/position profile differs between a loaded flipper and unloaded one. This difference is "snap".
And this is what I think differs from originals to remakes. Its not that the speed of the ball at the end of the flip is the same, because that is probably what they were aiming for, but its the speed of the ball and its acceleration throughout the entire impulse of the flipper. I think they do differ, which means they remakes hit terminal ball velocity only nearer the tip, and that OG flippers reach terminal velocity of the closed mass system quicker than the remakes do. This makes the control of the ball at the tip of the flipper harder and makes the remake flippers feel "mushy" like they are not "snapping" like OG equipment. To determine wether "snap" is different, we need the Slow Mo guys to film both types of flippers under both instances (loaded and unloaded) and see if the acceleration profiles are different. Basically looking for the second derivative of position versus time (you know acceleration is the first derivative of the speed which is the first derivative of position v.s. Time) I think this is going to be the ONLY way to determine what is actually happening, but what do I know, I was only a nuclear engineer in the Navy, and a aviation lighting engineer and a manufacturing R&D engineer for 15 years at a aerospace company.
Another way to think about this is, the OG flippers get the ball moving quicker so that at one point, the ball has reached terminal velocity at a much sooner time than the remake flipper. The resultant speed of the balls are identical at full stroke, but differ in between the at rest to full ball velocity curve versus time. This means the OG flippers "scoot" the ball and the remakes "roll" the ball. This makes remakes shoot different because ball spin is different as well as the end stroke "feel" doesn't seem as "snappy", and so the aiming of remake flippers is possibly different than aiming shots with OG flippers.
So this would also make them feel different whenever the player flips the flipper unloaded because without ball mass, the flipper position vs. time would probably be more in line between the remakes and OG because ball mass is the major component of the closed mass system, and unloaded the ability for the flippers to reach terminal velocity probably happens nearly instantaneously at the moment of the flip. But put the ball mass back into the equation and now the delivery of the impulse amplifies their velocity differences from rest until full stroke. I think even I feel the difference when I think about it, and to combat it I upped the power of the flippers until my shots where more in keeping with the muscle memory of shooting Bally/Williams flippers (like whats on my BOP). Ok, but what has that also done? I think I get way more airballs off Frank and the phantom flip and tomb treasure targets due to my terminal velocity being higher than OG equipment, and I get more rejects from the scoop and the left Bride ramp due to ball speed being faster than OG MB.
If you got this far into my explanation, I hope it made sense.