I would hazard a guess that the X-T4 that you all have received is made no longer in Japan, hence the lower quality. The one I picked up was made in China, and it felt nothing like a Japanese made Fujifilm camera! I have also owned the X-Pro3, X-T3 and X100F before I went GFX.
If I was to buy back into the X camera line I would only buy a Japanese made camera. I thinks in this case it matters where it is made and quality control. I hope this is not a sign of things to come, up to now I have had zero issues and thought the quality of Fujifilm is high.