If I'm not mistaken, you can have the same workflow with niri. You don't need to use "scrollable" feature of Niri, you can attach screens to workspaces.

I was a former Hyprland user but after I switch to Niri I didn't look back because I think it's kind of having best of two worlds.

In my workflow, I have browser on workspace 1, code editor on 2, CCTV Viewer on 3 (we have a baby and babysitter so I occasionally check them).

In the other monitor, I have slack, terminals etc.

So when I need to switch between browser <-> code (or terminal) I can do quickly. Scrollable comes in handy when you need to check something quickly; for example you are trying to solve something and you need to run some commands in terminal. In that case I just open a new terminal next to browser, do my job and get rid of it.

Also the Super+Tab view is awesome, you can easily see which window is where. Niri also some IPC features so you can find window id and make Niri focus to it. This comes handy if you use Vicinae (Raycast like launcher for Linux). I can switch windows with just using that.

One final note, I highly recommend DankMaterialShell - https://github.com/AvengeMedia/DankMaterialShell/ along with Niri.