breh they are intentionally acting dense like you couldn't give Shuri something to do and show her genius/ intellect by having her create and run the kimoyo bead communication system
have her have a mind for architecture and seeing a building she designed be finished in one of the black panther sequels
she could be into designing new wakandan aircraft and or other vehicle that Okoye or T'Challa think could be a great asset to wakanda if they where fitted with weapons
it's plenty of cool/useful shyt Shuri can do without stepping on T'Challa toes by creating his suits/tech/gadgets he use's
And you would still have folks saying that T'Challa should've been the one making those things instead of Shuri.
Honestly, this development is far from a big deal. T'Challa is still:
-The lead
-The Black Panther
-The King of Wakanda
-Master martial artist
-Enhanced human being
-Very well-versed in politics
-The face of the BP franchise,
without question.
Meanwhile, Shuri is a technophile who can fight.
As other's mentioned, there's nothing that indicates that T'Challa isn't a brilliant scientific mind himself. The difference is that in this version he delegated the task of designing tech to Shuri.
T'Challa has an entire country to run. Delegating is something heads of state do every single time.