Looks like you never handled a X-T4, mine has metal dials, the flip-out screen feels as solid as on any other camera that has one and overall build quality is as good or better than any other camera that is/was in my posession.
Did you register an account here just to come spread fake information?
I must admit this post really surprised me, I have just moved from a Canon DSLR and apart from the articulated screen not feeling as robust, and the battery/connector doors a little brittle, I thought the build quality was good. To me everything feels really solid.