Neither do I - I use either my phone, or my smart TV, or my fire stick. SSO works fine there, or you can use the QR based session transfer to SSO on your phone and then "sign in on another device" or whatever by scanning the QR your other device is showing. I think they call it quick connect or something.
It does what you want.
And if you think Grandma can't figure out scanning a QR code, Grandma is also not gonna figure out MFA lol.
I grew up in northern Vermont. There are a lot of people who simply don't know anything about what happens in the world - Vermont is very much like The Shire that way. The internet is unreliable and I grew up on DSL on copper lines from 1920, so FM radio is incredibly popular. Same with satellite TV. There's also a massive drug problem and large-scale unemployment, because Vermont (without me passing judgment here) is fairly anti-industry and doesn't have a lot of economic opportunities, especially up north in more rural areas like the NEK.
When all you have is people on the radio telling you the opiods ravaging your town are being smuggled from Canada and maybe 200 people in your town total who all listen to the same radio station, it's really easy to believe whatever you're told. It's just ignorance, not of the willful kind but the naive kind. VT is the second whitest state in the union and people will frequently literally almost never meet a black person, and so racism can be a real problem just out of pure naivity.
Vermont is, in many ways, the land that time left behind in the 40s and they're kind of only considered progressive because of UVM/Burlington and because they love weed, lol.
I do love aspects of Vermonters' heartiness and sense of community, but it has real downsides as well. /rant