This is a self-fulfilling issue; since Intel does not support ECC, ECC is not mainstream, so mainstream platforms don't care about ECC. It would cost motherboar

This is a self-fulfilling issue; since Intel does not support ECC, ECC is not mainstream, so mainstream platforms don't care about ECC. It would cost motherboard manufacturers ~nothing to support this properly, so if it were accepted as a thing they would, and it would eventually be a requirement for newer RAM technologies. ECC should've been mandatory since about the DDR2 era, practically speaking. That it isn't is a collective failure of the computer industry, and Intel takes a big part of the blame. At least I had no issues getting ECC to work on my Threadripper box, but sure, that's HEDT.