Yes, I use it at home but also a lot at work. Opening personal account and admin accounts in a bunch of different tabs for a bunch of different sites. Makes it super easy, no need to log in and out throughout the day. I have users that also will have our O365/Okta accounts as well as client O365/Okta accounts. Containers make it a cinch to keep everything separate and logged in at the same time.

I was asking about Chrome profiles, not Firefox containers. I use dozens of Firefox containers already, and it's my understanding that Chrome profiles aren't a good substitute because you can only use one at a time.

It seems that one could also run multiple instances of Chrome or Chromium inside docker containers with X11 forwarding.

No, though I prefer different windows as then you can have different bookmark bars for each context.