How about the ability to challenge anyone on FUT? I want a rematch, not a new friend.
Bring back trading players/items
Improve online connectivity and matchmaking so I don't get matched up with a +9 rated opponent. How about based on win/loss ratio(Fifa 16 accounts)? Introduce ELO...
FIX THE F*CKING PACK DROPS. I understand it's an effective business to simply rob the addicted of their paychecks but reward them more, they've certainly earned it.
Position freedom (let me change muller to a CM, or lichtsteiner to an RB/LB without having to get the IF)
Bring back the save custom tactic feature, add custom formations
Customize badges (like in COD), uniforms, balls, stadiums
Change club name for a fee whenever
GK should be amazingly hard to overcome without some clever passing and shooting. Goals should not be conceeded from 40+ yards and with a non-responsive GK who let the ball zip by his left ear. REALISTICALLY, GKs will stop anything that isn't from within the box and in plain view (so walls of players blocking GK's view could help slip one in)
More skill moves
More responsive defending AI (no kickoff crap)
Better possession statuses (I am trying to steal the ball and in a millisecond of "possession" I manage to throw away the ball)