wait the movie is'nt called (Namor and) Black Panther Too?
Wakanda was the strongest army in the Thanos saga.
Talokan , its still early to say..other than the invasion of Wakanda which was solo carried by their king..still have much feats to catch up to Wakanda in the MCU.
I think a full on naval assault like that would cost a lot of money they don't have.
Why they did'nt come up with something (which would cost like Angela Basset's lunch money) to dry the blue people AS WELL I have no clue.