First of all, you can't say the game is too easy when you play with City
Second point, on scouting and youth players, I agree with you when you say transfer value should rely more on age and performance and less on PA/CA. At the moment, it seems the AI will buy any player with high CA/PA without even looking at his performances and attributes.
I mean, you can have a 2 star player perfectly fit for the winger role, consistently performing over 7.30, and keep him forever : no big club will come and chase him. On the other hand, I've often seen 4 star players (@Barcelona, Madrid, City...) with bad attributes (for their position) and in spite of those attributes, being touted as great defenders. I can't understand how the so-called best defenders of the world can have 10 in Concentration.
This is really where we, human players, have an advantage : we can determine whether a player will fit in our team. I find the AI really weak on this side.