With that in mind, is there an official way to use those alignment dots? And I mean where do you want the dots relative to the end of the flipper? Should the end of the flipper cover and be exactly centred over the dot? Or just in front/above it? I sometimes will align based on the rails leading towards the flipper contact surface and aim to have that in one straight line. Or other times have the centreline of the flipper follow that line down the rail, which ends up with the flipper resting in a position a little bit further down.
All these alignment things change how the game plays significantly. More so on the lower flippers than the upper ones like on WPT. Not just where the ball is going to go when you instinctively hit it towards a ramp or target, but also in how you can play the ball with various flipper tricks.
I have a Getaway for example, and if the flippers are adjusted a little bit further down at rest, then when you send a ball through the supercharger ramp and it comes back down to the left flipper, if you hold that left flipper up and let the ball roll off and onto the right flipper, you can one-time it back into the supercharger ramp. Makes for some crazy points when actually in supercharger mode where the first shot gets you 5 million, then 10, then 15. I've had it up to 35 million for those shots all in that 20 second timer.
I think part of this with the alignment dots is that no machine or designer/manufacturer always put their dots in the same place with the same intentions. It's rarely mentioned in any of the manuals though, other than trying to mimic the angle you see in a photo or drawing of the playfield. This is probably getting pretty far into the weeds of playing competitively, but every other sport or game has some pretty specific ways to get up the playing surface or court or whatever, whether that is pool, or volleyball, or darts. Not pinball though. Every set-up seems a little different. Not to mention the differences in clean balls/fast playing surface, coil strengths, playfield pitch, etc.