AMD only supports small fractions of the deep custom eco-systems built around models such as Stable Diffusion. Good luck getting half of the shit built for ComfyUI or Automatic1111 to run at all, and frequently those features are the killer ones which motivate folks to want to do AI in the first place. There's a reason why Nvidia is a first class citizen among all of the AI clouds. AMD is even behind Intel in this regard, because at least Intel had an existing robust ecosystem of accelerators (i.e. intel optimized sklearn/pytorch, OpenVino, etc)
AMD can be 4x better in every way compared to Nvidia hardware wise but if they can't get developer communities to build around their equivalent to CUDA and its ecosystem than it's not looking rosy for AMDs future.