As long as it works nobody will care how they achieve itThat much is a given. What AMD had in RDNA 2 is very much equivalent to what Nvidia had with Turing: first release tech is always fairly basic. It will be interesting to see if they continue with the current structure, where the TMUs perform the ray-triangle intersection calculations and the BVH traversal is done via the shader cores, or whether they go with something completely new.
But AMD can't afford to be slower than Ampere, that's for certain.