one API is much more than a plain old SYCL distribution, and still.
People like to talk about Apple CPUs, but keep forgetting they don't sell chips, and overall desktop market is around 10% world wide.
ARM is mostly about phones and tablets, good luck finally getting those Windows ARM or GNU/Linux desktop cases or laptops.
Servers, depends pretty much about which hyperscalers we are on.
RISC-V is still to be seen, on the desktop, laptops and servers.
Where AMD is doing great are game consoles.
maybe on some level but not that level you're describing. pretty much everyone at AMD understands the situation, and has for a while.
according to public information NVIDIA started working on CUDA in 2004, that was before AMD made the ATI acquisition.
my suspicion is that back then ATI and NVIDIA had very different orientations. neither AMD nor ATI were ever really that serious about software. so in that sense i guess it was a match made in heaven.
so you have a cultural problem, which is bad enough, then you add in the lean years AMD spent in survival mode. forget growing software team, they had to cling on to fewer people just to get through.
now they're playing catch-up in a cutthroat market that's moving at light speed compared to 20 years ago.
we're talking about a major fumble here so it's easy to lose context and misunderstand things were a little more complex than they appeared.
Look where Apple Silicon managed going in the same time frame...
Because of this, I would never consider another AMD GPU for a long time. Gaming isn't everything I want my GPU doing. How do they keep screwing this up? Why isn't it their top priority?