I completely agree with you.
I've played the XCOM and SHADOWRUNNERS series quite extensively, but only in single player mode.
Playing with your whole team before the enemy can act certainly favors you in almost all situations.
However, with the addition of co-op play, it's definitely interesting to experiment with innovative combat systems, both to inspire freedom and to bring us closer to what a real combat situation would be like.
I really liked what you said about the possibility of different strategies in a simultaneous combat, as the variety of decisions increases dramatically when we share initiative.
However, it's still important to have coherence in each player's moves.
So, having an option to disable or enable shared initiative in the room creation would be a good and simple idea.
