I also live in the browser and prefer everything to be in it, but I do know plenty of people who prefer their desktop apps, especially some windows users.
I'm on Gnome, different windows of the same application get grouped together. Useful to have the different logo, and separate from the browser.
No reason this has to require an electron wrapper, you could do it with the 'save to desktop' options, not sure whether any browser actually offers it yet though.