I've been bowling since about 1960 and a lot of things have changed in that time. A lot of advise that was given over the years is now considered 'wrong' and some of the 'wrong' things then are now considered to be 'correct', so I don't see how any of us can criticize each others advise.
When I started bowling, it was wrong of me to throw a semi-roller as the correct way was to throw a full-roller, or so I was told. Beginning bowlers had to go through a process of grips - start with a conventional and when you got the basics down, you could move up to a semi-fingertip and if you got your average up to a certain level, you could then move on to the full-stretched-fingertip grip with excessive reverse. That was the 'expert' advise back then and it has changed just a wee bit nowadays. How many drillers are encouraging the use of semi-fingertip grips these days or stretched fingertips?
I was always concerned about my track because I could never get that tight ring that you were supposed to get. I had a lot of flare in some of my bowling balls (not all for some strange reason) and the advanced bowlers kept telling me that that was wrong, that there should be no separation in the flare rings so I got rid of some bowling balls because I couldn't keep the rings tight on those.
Youth bowlers were not supposed to keep throwing with both hands after a certain age or strength limit was reached. You were supposed to learn how to release the ball with only one arm/hand. Plenty of young bowlers were advised not to continue to bowl with that method as it was not the correct way to bowl.
This game keeps evolving and that means that the advise will continue to evolve to keep up with the game. As I said, I don't know how we can know what is really right or wrong for each other in that case. Thirty years from now a lot of what we consider correct will no longer be thought of that way. What will always be wrong will be to use personal attacks against each other, to be internet bullies or trolls. That, I hope, will not change.