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If more people understood this, we would be asking for better profile support on Firefox and for container support on Chromium, not suggesting containers to people who need profiles or trying to use profiles as if they were tab containers.
I want profiles because they provide exactly what you mentioned: separation. I need different extensions, bookmarks, history, etc. And inside each profile I can use containers if I want to.
So explain me:
1. How do I set up a new profile in Firefox. In Chrome creating a new Profile takes 3 clicks and entering a name.
2. How I open two instances/windows of Firefox at the same time each with a different profile. In Chrome opening a second profile is two clicks (when Chrome is already running)