Scale relative to what? The fancy ones are the only ones I've ever encountered in Germany except when dealing with an American company that insisted I upload photographs of my ID card directly to them (which due to the lack of a proper privacy policy brought me close to ditching the client that asked we use them).

There's also Postident (which involves walking into a post office and showing the clerk your ID card in person) and eID (which requires a compatible smartphone and uses the digital data on the ID card itself). Video ID is pretty ubiquitous these days, so I'm not sure why you think it "doesn't scale".

If you're suggesting alternatives that only rely on biometrics, I don't think those are sufficient to fulfill the requirements of anti-money-laundering laws in Germany even if American KYC laws might allow them.