Can I answer this from a factual stance?
The Russo’s and co stated in one of their interviews, they didn’t want to introduce something in their movies that Ryan hasn’t had a chance to debut yet.
They don’t wanna “step” on his shoes and take from his world, so it’s a matter of respect.
Now from a movie perspective, nephew, as technologically advanced as Wakanda is......... at the end of the day to make complainers happy “THIS MOVIE WAS GROUNDED IN REALITY” to a degree.
They ain’t ready like that for kamikaze outer space alien attacks.
I’m sorry, I just don’t believe their training and tech was 100% prepared to face an enemy they had no intel on like that
Martha