The one caveat -- and it's a big one -- is that Niri numbers workspaces dynamically, and won't let you have an empty workspace (except temporarily).

You can have named workspaces now, I have ones dedicated to terminals, and browsers. They always have the same numbers.

Oh, perfect, thanks! I've been using Niri for less than a week, hadn't got to using named workspaces yet, and missed the bit in the docs where it says they can be empty.

I tried it and I'm completely sold!