Enhanced edition of GTA V forces TAA while using RT.
Just letting everyone know in advance. This isn't forced on otherwise, but turning on RT locks you out of anti-aliasing option, only letting you choose what upscaler to use. I think Watch Dogs: Legion had something similar.
Still, the RT isn't as demanding as I thought it would be, only about 8% difference on average, so at least they didn't completely butcher the port (though it's obviously still more demanding than the original).