But according to CDC, both people have to be vaccinated to talk to each other inside. This means that if one person is vaccinated you can't see you're immuno-compromised grandparent anyway.
Yes, but if your child is school age -- schools which are now increasingly going to in person instruction -- and you are immunocompromised, what are you going to do? Same question if you live in a multi-generational household, but now there are grandkids going to school and kids going to work.
I see elsewhere you're claiming that long Covid isn't a thing. It is, full stop. Unless you're suggesting that living with lung and heart damage caused by Covid isn't a complication of Covid?
Long COVID is post viral fatigue syndrome. Really sucks when you have it, nothing singularly new about it as far as any available evidence shows. A bunch of people are experiencing it all at the same time, hence the prominence in the media. "Long flu" is much more diffuse in time, so not media-worthy. Mine was 3 months of hell at 18 years old.