Despite using it (and many other formats), I don't understand the appeal of full frame.
If I want something pocketable, then either an APS-C like the X-T30 or a mft like the E-M1 II or G9 is more appealing, especially the mft due to the more potent IBIS and smaller lenses that make it super easy to pocket the camera with a lens on and to carry other lenses around in another pocket.
While the camera body of some full frame cameras (like the A7III) can be of similar size, with a lens on it can't fit in your pocket if you want anything other than the 50mm or some of the 85mms. So it ends up being something that either needs to be worn or carried. If I was going to trade portability for image quality, I'd just buy a GFX100.
Full frame seems like a weird sofabed.