What I'm suggesting has nothing with this though. In fact, it's the opposite. Streamlining T'Challa base gear in his suit allows him to not allow him to pull out a gadget or new suit just to take out a higher level threat. It's what you are suggesting that leads to this: That T'Challa needs to have a different suit to deal with other level threats.
The thrice blessed armour is a redundant addition to T'Challa's gear that has no use that his suit can't have without overcompensating. This is the same issue Batman (that you bring up) that had recently that is a problem. Compare these two instances of Batman confronting Darkseid: When he bargains to rescue Supergirl and when he confronts him in the forged Hellbat armour.
The first instance, Batman only wears additional Apokaliptian armour and he uses his brains and a well played bargain to win against Darkseid
This is what Batman is about. Being the human underdog everyone underestimates but has the will and brain to do whatever it takes to win.
Batman in the Hellbat armour that's forged by the entire Justice League and can beat them all (having most of their abilities) and can also beat Darkseid is not what Batman is about in my opinion. This is the kind of thing Tony Stark would do, and why I'm generally against T'Challa having any additional sort of armour.
And just to finalise: Black Panther is not Batman, nor does he need to be restricted in that idea of being like Batman. Batman is a regular human, a street vigilante (who is good enough to be a league member) and a detective. T'Challa is a king of the most technologically advanced human nation on earth, is an enhanced warrior trained from birth, and is the avatar of the god of his people. That alone puts him above what Batman is defined as. There's no reason why T'Challa at his base level shouldn't be handling more powerful threats with a combination of his superior intellect, his enhanced stats, his almost unparalleled skills, and his access to some of the best technological innovations on Earth. That's who he is.