I did the same, although in my case I sold the 50R (I'd previously sold the 50S) plus GF lenses to concentrate all my funds on expanding the X system. To be fair, I've been involved in an ongoing project requiring reportage as well as architectural photography and G-system bodies/lenses could not cope with as well as the X system (e.g. AF too slow and/or no really good UWA solution for architecture).
At the pixel peeping level I really miss the very clean and sharp look of the GFX 50mpx sensor, over the 26mpx sensor in the X-T4 that I own. At the practical level, I could show you 30x20 prints I've done with the X-T4 and you'd be astonished at how good they are. That's not a surprise to me as any printer will tell you that megapixels aren't the be all and end all in printing.
Value for money was a consideration. GF lenses are for the most part horrifically expensive compared to equivalent focal lengths in the XF range. And, of course, there are some focal lengths at both ends of the range, as well as apertures, and zoom ranges that the GF lenses do not and probably never will cover.
The final deciding factor for me were actually two XF lenses: the XF80f2.8 macro and more importantly the XF50-140f2.8. Both lenses on my X-T3 and later X-T4 bodies, for all practical purposes, yielded superior looking images to the the GF120 and GF45-100 lenses I was using on my 50R body. And they were much more convenient to handle in real life situations. I know that may be hard to believe but I shot both side by side more than once in situations and came away delighted with the XF images and scratching my head as to why the GF images were either not as good or not so much better.
I can understand going for the X-T5. I've seen images from that camera which at the pixel-peeping level are every bit as eye-catching as the 50R (no idea about the 100S). In fact, I made a comment somewhere here in the Fuji thread about the company being in danger of eating its baby with the new 40mpx APS-C sensor..
If money were no object I'd have a GF system full of all the lenses but until I win the lottery, or I suddenly luck into some massively lucrative photography work, the value proposition of the X system is hard to beat, imho.
Just my two cents
LouisB