@Iron_Guard8 Being able to choose sides in ops is something Bfn horrendously removed which made personal quests for specific characters a slog.
Solo play in general needs to let us choose which side we want to play on while we're deciding as gw2 was by which team you were entering the portal as and Bfn was just rng.
Another feature to add back is that matches start the moment you join in solo play. Gw2 was perfect at this and then for some reason Bfn removed this and joining too early forces you to wait and too late means you've lost valuable time.
Keeping boss hunts and free roam areas locked until they've been beaten encourages people to play through them Atleast once before they jump into hunts sounds like a great system.
Adding a bot backfill system isn't bad here because hunts almost always require four man teams for victory and ops can replace people who leave midgame this way.