I think that part of the issue is the split between CDNA for data centers [1] and RDNA for consumer products [2] with AMD only having the money to focus on the bigger data center market. There are rumors that both architectures will be merged into UDNA in the future, which will hopefully improve ROCm support, but for now it's lacking

[1] https://www.amd.com/en/technologies/cdna.html [2] https://www.amd.com/en/technologies/rdna.html