That makes sense in the context of a window manager, because the processes live outside it, meaning it has very little to no state of its own. But when developing a web app, you have to login to it every time you reload the code, because being signed in is in-memory state.
> meaning it has very little to no state of its own
That's false.
Windows are affected to workspaces. They are sorted in a particular order (set by the user as they move the windows). Each workspace uses a particular layout. One particular window on each workspace last had focus. There's a "current workspace" pointer. That's a bit more than "very little to no state". All of that is preserved upon reload. And I bet my hat all that state was in-memory.
Then there is Yi, a text editor. There's no avoiding lots of in-memory state in there.
Can be in-memory state. Everything beyond toy-sized I've ever worked on has externalised this sort of state to a database of some kind, if only so you can run a second copy for the sake of failover. I don't believe your example is relevant.
