[tyingq]

I believe this is further along in other countries, but in the US, you lose a lot of sales as legit customers don't remember their 3DS passwords. I see stats quoting pretty high 3DS adoption in the US (30+%), which seems odd to me personally as I've never been prompted to use it.

[IIsi50MHz]

3DS to me is still a Nintendo handheld game platform. I've never been asked to use anything other than 2FA — usually pretend 2FA in the form of a text to a mobile number. My hardware 2FA mostly sits unused, because almost nobody asks for it.