They have, see eg this from 10 years ago: https://www.tomshardware.com/news/AMD-HSA-hUMA-APU,22324.html https://www.tomshardware.com/news/AMD-HSA-hUMA-APU,22324

They have, see eg this from 10 years ago: https://www.tomshardware.com/news/AMD-HSA-hUMA-APU,22324.html https://www.tomshardware.com/news/AMD-HSA-hUMA-APU,22324.htm... Implementing the software support and getting operating systems to play along and fragmentation between GPU vendors, as always with GPUs on x86, have been the problems. From all accounts it's been working reasonably well on the consoles though. Also chicken-and-egg: low GPU compute usage uptake outside of games has meant it's not improved lately.