Starcraft isn’t a MOBA and Tychus isn’t a MOBA commander, Dehaka and Kerrigan played hero solo are.
Sorry to not be sympathetic, but this game is about unit control. Control groups have never ever meant you don’t manually adjust unit positions. Don’t you separate off a unit marked by a Raven’s Seeker missile? Don’t you pull Tychus back if he’s taken a lot of damage and Sirius is at full HP? Don’t you split with Marines?
Personally I have all Outlaws on 1 and only regularly have Sam on 2. Nikara’s positioning I just handle as part of the usual position cycling I do manually. If you use F2 and always move your Outlaws together, try splitting / cycling their positions – you’ll probably get used to it fast.