I wouldn't say changes to player development has made it more realistic to real life look at arsenal the average age in real life squad is now 24 years old and they have a few under 23 s playing in Saka, saliba, Martinelli, in long term saves now in FM they don't younger players under the age of 25 regularly at all like less than 10 starts in a whole season the player development have made the balance even worse not better just now its the opposite squads too bloated with older players and young player finding it insanely difficult to get regular football until they are 25/26