This is a scrolling WM (not tiling). I've been using it as my daily driver for over a year now, and it's awesome. I never liked tiling WMs because I do a lot of web work, and I often want a large code editor and a large browser window and a few terminals open. I don't like having stuff scrunched into a little rectangle, but I do like having all of that related stuff grouped in a single workspace. This works perfectly with Niri. I can keep my editor in the center, a peek of my browser to the right and a peek of my terminal to the left, and easily flip between them, resize, stack, etc.

I know it doesn't sound all that interesting, but once I used it for a while, I just couldn't go back.