I just bought XT5 last week after selling XT3 and today took it for a walk.
I've decided to stick to just one lens and it was adapted Pentax 50mm.
Apart from normal settings I used two custom presets and noticed that when I first switched to different profile I had to change focal lenght of adapted lens in mount adapter settings.
Changes that I've made initially in normal mode, ie. setting focal length and naming the lens were "gone" after first switch to custom profile.
What it means is, every time you change adapted lens in "normal" mode or using custom profiles you have to update focal length if you going to change to different custom profile.
I don't recall seeing this on XT3 probably because mount adapter settings was located in shooting settings section of the menu and not in I.Q. section like on XT5, or I never paid attention to this before.
Anyway, I find it very annoying that I have to remember to update custom profiles that I want to use on given day every time I swap lenses.
P.S. Apologies for my grammar, English is not my first language.
