What's this have to do with the MCU and their version of him?
.
Practicality in the way something major is introduced into a film series compared to how the source handled it.
Damn you Momoa! So presumably to avoid comparisons with Aquaman (who let's not forget was the rip-offe not the rip-offed) the Aztec-inspired look of Namor and his people extends to them not being from Atlantis but from Tlalocan, which in Aztec myth was the afterlife reserved for people who drowned or died from water in some other way.
Oh, I can hear the rants a-comin':
"Fucking Disney has race-swapped Namor and his culture!!! What the fuck?? Everyone would be fucking livid if someone did that to Black Panther, but that ain't gonna happen, is it?!? You know why! You KNOW WHY!!"
So LEGO just gave away who the new Black Panther is
Not a surprise, since it parallels the comic character's trajectory.