I will take heat from people on this but from a company standard this makes perfect sense.
Only 5% of the people who play this game are hardcore SIM dynasty players.
The rest want to win 110-0 win 9 Heismans in a row and 50 game winning streaks. ( the features above don't matter) and will buy the next years game without hesitation.
Other players only play online ( the features above don't matter) these people have to buy the game each year as the old one can't be played anymore.
Obviously the adaptive AI is the hardest to program and would take countless hours to fix and adjust.
They have an exclusive market an it really is not worth the cost to make the game signifigantly better.