I certainly understand the different tools thing. I used to shoot with dual CFV-50 and 50c backs on bellows and then mounted to two different SLR bodies for studio work. Today I have a GFX. It isn't as versatile on bellows and can't mount as many lens types, but it is way easier to use in studio. That said, it is a slug to work with in macro. The reason is the same as the X-T3: when the lights go down, the sensor or processor starts to hiccup to such an extent that it is hard to tell what is in focus and what isn't. This isn't a problem with a
Leica SL or even Canon 5D MKII. The GFX outputs good image quality (similar to the 50c) but it isn't better enough to justify its spot in my studio. I will go back to FF for that.
The X-T3 is sort of in a tough spot. It should by now have the advances to AF that the X100V and Pro3 have, but it doesn't. I also use the Fringer adapter. It works great. But AF-wise, Fufjilm are behind Canon, and not by a little, especially as it regards focusing in indirect low light.