But did they? In Black Panther 1 we saw Planes, Projectile weapons, and Rhinos with armor(maybe tech couldn't remember). Where was all this in Infinity War?
Op is right they did downgrade Wakanda for the film. It was one of the things I didnt like about the movie. You can't have Wakanda a threat to take over the world (if Killmonger had his way for the "sun to never set on the Wakandan Empire") but that be your defense of your homeland, even on short notice.
I was watching the movie thinking if this is what they got defending their homeland, then if Killmomger would have beat Tchalla they would have got washed by any 2nd world country
.