Being able to have windows of the same app assigned to different spaces would be the big unlock for me to able to use your app. Not only do I do things like separate work and personal Chrome profiles (with a window open for each), frequently I'll have a Chrome window open for a specific project with tabs just for that project, so I can switch fully into that context when I want to work on something. I also frequently have sensitive tabs open that I group into a window so I don't risk oversharing something when on a Zoom call for example as I flip through my tabs.
