How can you have different bookmarks, extensions, and maybe even a different theme (so you know you're using the right window) with containers?
The answer is: you can't. Because containers and profiles are different things.
That's the "sacrifice" you're asking users to make. To change the way they use browsers, to adapt to something that is useful, but not a complete replacement for the features they want. You're asking them to mix stuff and to be careful not to type personal stuff on a work container (or something like that).
Yes, changing from Chrome to Firefox (and vice-versa) means that you need to make some sacrifices. I moved to Firefox and lost good profile support, have a higher battery drain, and have to deal with Firefox's inconsistencies (UI, ctrl+click behaving differently on links vs bookmarks, etc). I'm okay with the trade-off, but PR talk and positive outlooks don't make these annoyances and downsides go away.