Breakout Sessions (and self select) via Browser

The ZOOM Guide says you need to have the desktop app for being able to participate in breakout sessions, but we haven't had a case, were this didn't work via Chrome/Firefox/etc. in quite some time.

Now, we want users to be able to self select breakout sessions in a bigger event and ask us the same question: Will this work, if most of them show up without having the desktop app installed or will we find ourselves having to manually select all participants into their respective rooms?

Maybe some of you use this often and can offer your experiences.