T'Challa's genius could have been handled by having him be responsible for the upgraded habit and any tech that he personally uses while Shiri creates everything else or had Shuri tell Ross that the stabilizing field used to depower vibranium was T'Challa's idea.
I didn't mind that opening Wakanda wasn't originally his idea. Having his arc focus on him becoming his own man and king and not following his father and his ancestors footsteps worked out fine especially since this version lost T'Chaka as an adult instead of a kid.
I just wanted a more Priest like T'Challa but that doesn't seem likely unless they introduce a variant at some point.