Although I see why tabs are nice, I think it comes down to the kind of software. Photoshop, Illustrator, makes sense to have tabs.
For Rhino not so much. Apart from what Pascal mentioned, (I do have a good number of crashes because of GH, and big files) I also find it quite comfortable to be able to switch windows with Alt + Tab.
Rhino’s interface is already pretty fragile, clicking on the material library on a file with a couple of materials already freezes for a bit… I don’t want to think about clicking on each tab jumping from one big file to another.
But yeah, tabs are nice. Cinema 4D has recently added tabs too. Before it had all files inside one window but no tabs, you could and still can switch by pressing V and selecting which project you want (no click needed, just hover the mouse). I find this to be very comfortable and practical.