After reading about it repeatedly here, I finally tried Multi Account Containers and I'm disappointed. I want to press a button and get site X open in container Y. But as it is, after searching for the container, you then have to search for the website you want to open in it separately. It makes having lots of containers hard, plus there's the risk of accidentally opening sites in your "main container", etc. You have to do twice the work for every new site, maintaining bookmarks and containers.

There's a function to always open a site in a container, but this obviously falls over if you have multiple accounts (aws, gmail, etc), plus the UI is poorly communicated.

There are requests to make it so you can associate a container with a bookmark, for instance, but apparently Moz prevented Moz from doing this via browser apis, and have been powerless to do anything about it for years.

It could have been awesome.