Couldn't agree more. I am currently not bothering starting my long-term LLM save until i get any updates on whether or not this has been fixed. There is something wrong about youth development for sure, and it was the same in FM23. In my beta-save i noticed many times that i found a really good wonderkid at the age of 15/16, who looked destined to become a big star, but i started noticing that they did not seem to develop at all. I had one guy who i was finally able to sign when he turned 18 just to notice he had barely had any development at all, and didn't start developing in my squad either. I get that not all players should reach their potential, but it happens way too often. The same happened in FM23. On all my saves so far in this game, Estevao, who i believe has like one of the best PA in the game(?) is still in the Palmeiras B team at the age of 19-20 with barely any development.
There are many things about FM24 that bothers me (AI rotation and IQ, player valuations, player wages, promises etc.) but as someone who mostly enjoys to develop their own players instead of just buying wonderkds this is just gamebreaking for me. I am tired of having a "golden generation" that just turns out to be a complete failure.