mylar is great for collectors because it has extended the life of thousands of games.

As a player though, I hate it. I’m currently renting a Gottlieb silver slugger with an absolutely immaculate playfield and I lose easily eighty percent of my balls to a bubbly insert over the lanes or between the flippers. If I lose a ball or even get frustrated by Mylar on location I will never put quarters in that game again. Bubbly, ripped or otherwise poorly applied Mylar in the wrong place can ruin a games playability. I don’t care how good your funhouse looks if I have to worry about the Mylar every plunge.

So, that’s why people hate it, because They’ve lost balls to it, Had balls get repeatedly stuck on it, and have probably put hours into fixing it, and lost sales Etc.

Well obviously there are other things that can ruin a games playability. Mylar is the only one of those things you mentioned that was done to the machine intentionally. If someone said “I put protection on the flippers that makes them look good But they frequently cause the ball to drain just by being there and they are nearly impossible to replace without risk to the rest of the playfield” I would absolutely throw that baby out with the bath water!!