If you want your customers to spend supercomputing money, you need to have a way for those customers to explore and learn to leverage your systems without committing a massive spend.

ARM, x86, and CUDA-capable stuff is available off the shelf at Best Buy. This means researchers don't need massive grants or tremendous corporate investment to build proofs of concepts, and it means they can develop in their offices software that can run on bigger iron.

IBM's POWER series is an example of what happens when you don't have this. Minimum spend for the entry-level hardware is orders of magnitude higher than the competition, which means, practically speaking, you're all-in or not at all.

CUDA is also a good example of bringing your product to the users. AMD spent years locking out ROCm behind weird market-segmentation games, and even today if you look at the 'supported' list in the ROCm documentation it only shows a handful of ultra-recent cards. CUDA, meanwhile, happily ran on your ten-year-old laptop, even if it didn't run great.

People need to be able to discover what makes your hardware worth buying.