build diversity question

im not very far in the game. just grey harbor. but im seeing a lack of reason to venture beyond this setup.

braum=tank, invest in damage shields and taunt generating overcharge

illaoi=healer, get the speed heal to remove ailments

samurai boy (yeah i forgot his name)= buff damage, self buff and wreck things.

originally i was building each characters unique effects, concussive, tentacles, whatever samurai boy uses, but quickly found the lack of synergy to result in me taking more damage than i wanted. so i changed to this. braum pretty much only uses 3 moves, taunt, shield, and ram (to move enemies out of wildcards)

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edit: i should say, im having fun, this isnt a complaint, just a question