Quoted from CrazyLevi:

I think it's ridiculous to say that a variable delay of almost .5 ms can't effect players just because it's supposedly undetectable to the conscious mind.
Even if that were so It could still affect players. It would affect us subconsciously like so many other things do. We aren't really in control of our own minds.
People have been saying for a long time they notice a difference. The whole game is being run by some cheesy emulator instead of being done the correct way. If Stern pulled something like this can you imagine the shit they'd be catching?! It wouldn't be a 2 page thread I can tell you that.
And it's not just the flippers. It's everything - slings, pops, kickers, saucers, castles...literally everything the software controls is subject to the varying delays.
Your vulnerable mind is going to pick up on all that noise and get confused and unsettled. Just ask any brain doctor.

Quoted from YeOldPinPlayer:

As many others have noted, it's irrelevant if you can perceive the difference. What is relevant is if the shot is thrown off by the reported delay. A variable delay will throw the shot off in a way that can't be compensated for.

Quoted from jwilson:

The difference is that the original Fliptronics system is discrete electronics, with no software at all. The only lag is the speed of electrons in a cable.

Quoted from CrazyLevi:

Yes, this is correct, but it's not about "fine tuning," these aren't Swiss watches. It's actually quite the opposite - it's a simple system without a lot of unnecessarily complicated nonsense involved in between to create a variable delay like the MMr and AFMr system. That's why a 1948 gottlieb will have no variable delay in it's flipper response and a 2017 AFMr does.
When you turn on a flashlight, it turns on instantly with zero variable delay once the switch makes contact. Re-design the system to include a bunch of software that's doing a bunch of other things at the same time and it would be a different story.

Quoted from Mvfvette1:

That's what it's starting to look like. Originals may have even an even wider amount of random delay than the remakes. Scores on the originals will now be decreasing because of this info. Professionals will no longer be hitting their shots with as much regularity on the originals. Also, the originals should no longer be used for tournament play.

Quoted from jar155:

People jumped on the delay explanation because nobody has had a reason to point to until now why the games have a different feel to them. A lot of people claim difficulty hitting center shots or chaining ramp shots where they've never struggled to do that before. Lots of high level players have said this from the beginning and have stayed consistent in those claims. Finding that there's no difference in flipper delay doesn't mean that the games play the same, it just means that flipper delay variance is not a factor.

Quoted from FalconPunch:

Wasn't just Keith Elwin. Almost all top 50 ranked players feel like something is different.
And yes it a pity that some people think there are alterior motives. I don't care about resale value and elitism...
The conversation is open and I hope it continues. I hope someone can figure out what the difference is because it's still there on default machine settings.