As stated by AMD the ECC support is on PRO version for complete support (with some exeption as in the AM4 line... you know it's AMD lol) and as they are OEM only (at least here) they are less expensive than the regular one with the cardbox and plastic protection...

At first I thought this was kind of confusing, since the Pro models imply there's no obvious technical reason this couldn't be done. Then it became clear: one of the only significant differences between consumer and professional grade GPUs is whether the VRAM has ECC. Not all businesses need a lot of compute power, but they would care about data integrity, and AMD is going to want more money for that. Considering not all AM5 mobos support ECC and the target demographic of the 8000 series is the average person, I don't think it really matters too much that it isn't supported.

APUs are already memory bandwidth limited as it is. There would only be sparse edge cases where ECC would even be a consideration. AMD's resources are already artificially limited and stretched thin as it is. The handful of weirdos that are going to complain about this being a missing feature aren't worth the trouble.