That's simply due to sales, on both fronts. Most people still don't even fully understand the AM5 situation. A quick google will show you that all vendors are impacted.
Don't think it is simply due to sales, not saying the problem doesn't exist on other brands/vendors but far more often when I see those kind of issues mentioned on Gigabyte or MSI, etc. it comes down to people running very large amounts of RAM or high frequency RAM and not understanding you can't just stick on XMP and expect it to be stable.