Sure, I get why they did it. The DCEU Namor-fied Aquaman so Marvel had to either try very hard and blow DC's Atlantis out of the water, or they could do something else. They chose the latter and it's so different that it's not even the same character. I've said it before, but if they wanted Black Panther: Native American Version, they could've easily reworked White Tiger into that. Why ruin Namor in the process? As a detached OC I like Manletmor, if I let go of all my expectations of what Namor should be, and see this guy as a wholly new character. But it grinds my gears, you know? They could've easily done Namor properly and painted him as an unapologetic imperialist, a threat from the deep. No misunderstood hero nonsense, just a millenias old, dormant culture filled with magic and ancient science rising from the depths to take over the world. That Namor would stand out next to Momoa's dudebro Aquaman. I'll be buying an Aquamomoa as a stand-in, sure, but just for the appearance and because it's the best I'll be able to get. The MCU could've done Namor properly and had him stand out next to Aquaman, but they just didn't want to. And as I've said before, they could've gone with a Proto-Egyptian aesthetic ala Nadia, which would've been different and still accurate. But they didn't.
Either way, it is what it is. In a vacuum, it's a nice enough character and new origin. It just irks me as a fan of the original. I'll get my Stealth Aquamomoa AKA 90s x 00s Namor, stick him in the back of my Illuminati, and I'll move on. If anyone's found a new favourite in the MCU Ku'Kul'Kan character, sure, more power to them. But I think as far as aquatic races of 2022 go, Cameron's Alien Blue Cats will blow the Talocanil out of the water, since the movie really didn't spend all that much time with them. Attuma was the highlight I thought. I would actually be pretty tempted by an HT Attuma figure (if HT made him, which is unlikely, and if I had cash to spare and a place to put him...). Maybe they should do a D+ show with Attuma as an underwater Conan exploring the deep. Dunno, I think an MCU Talocan flick could be pretty cool, but I don't see them doing it. It'd be too costly and Avatar 2, regardless of its quality as a film, will be the best aquatic adventure in a long while, whereas the MCU is struggling with basic CGI as is.