I think this is more a problem to do with motherboard manufacturers than AMD. The manufacturers decide which boards get a Ryzen 3000 stamp of approval, and BIOS

I think this is more a problem to do with motherboard manufacturers than AMD. The manufacturers decide which boards get a Ryzen 3000 stamp of approval, and BIOS support. Though maybe AMD should have been more stringent about their motherboard requirements regarding forwards compatibility with Ryzen 3000. Even if there were more serious issues, I would argue that AMD did the right thing keeping the AM4 socket. Since this varies from board to board, it's obviously not a deficit of the socket itself. At the end of the day, nobody is forcing you to keep your old motherboard. You just have the option to. If you can save 25% by not buying a new motherboard, it probably justifies a small performance deficit.