I fully agree. The Slack model of having a different login per "server" is good for workplaces, but Discord is incredibly good for "communities", hobby groups, and other casual groups.

As suggested by another commenter here, a hybrid model would probably be ideal for Matrix, where you could log into different spaces with different accounts if you want, but aren't forced to.

I would go one step further and propose that you should be able to have multiple Element windows open, so you can have your "work" space or spaces in one window, and your other spaces in another window.