Why did EA end up cutting access to teammates earlier in the game & AR Vanguards

I remember when you first played the game on the 360 Jack was an assault rifles vanguard and had 2 choices  and that all depended on yourFirst mass effect Character but that changed with Genesis and now if you choose Vanguard you can only use Shotguns. I wish EA would re-enable this and also access to Tali and other squad members earlier in the game I also remember having Tali having an assault rifle or Sniper Rifle which depended on your first Mass effect Shepard. I also noticed that a lot of things are different and were cut out from when the game was on 360 and al ot of those options aren't available anymore.