Your quoting is really confusing as you bolded a lot of my text as well!
Slide tackles are too many for the length of match. I see more slide tackles in a 10 minutes game of PES than I see in an entire 45 minute half of PL football. They (the AI) rely on it/default to it too much. I slide rarely in a match and it shows in the foul stats.
Your are basing that off of just PL football. I watch multiple leagues, and quality and there are a LOT of slide tackles.
I start the ML with ML defaults. So the players range from 60-70. My youth team in the following summer had 12 players over 70 in it. Mostly all better than my current squad. I want my 16 year olds to be mostly worse than this. Starting around 60 at most (some start here) and so you actually need to leave them in your youth team for a few years and loan them out before they're ready. Your youth team does also have quite a few players starting around 60 and below, however, after 3 years, none of these, through quite stringently selected youth training have developed to be anywhere near a match squad and from their predicted graphs, none would ever develop above 70. The youth system at the moment seems to be balanced for your starting line-up already being in the 80s for each player. I want to have a reason to develop youth, rather than just swap out my entire team after the first window and end up starting mostly 16 year olds. However, this is specific to people playing with the ML default team. I know many want to play with realistic squads and so won't see this as an issue for them
I have two saves, a default one and realistic one. Even in my default save the following summer i barely had any over 70.. i think it was about 3 maybe 4. I love developing youth and find that i my defensive youths generally are better but my attacking youths are not.
You can create your own manager if you're on PC and happy to do a bit of modding (hence the 'easily' condition being in brackets).