For me, the X-T5 works perfectly. No need to add additional 'features.' But I wish they can work on these things to can make it even better:
- a better EVF: I need the EVF to be big, high res, and color accurate
- a better LCD screen: it needs to be at least as good as any current smartphone screens
- a better menu system: learn from Leica or Hasselblad?
- a longer battery life never hurts
- a better camera strap system: have you seen the old Hasselblad or Rollei straps?
- Simplify lens thread: too many filter sizes!
Those smartphone screens aren’t being adopted by cameras for a reason, because they cost a small fortune.
But so do cameras nowadays. How much more would it cost to adopt a cheap OLED screen, like $/€20? I totally agree with points 2 and 3.
I think this entire screen topic is a bit off-track. There is no use at all using "current smartphone screens" on cameras. Why? Because smartphones are made for gaming these days and feature 120Hz screens, which is completely useless on a camera. Also, with current resolutions going over 3K (vertical), cutting a screen like that in half would perhaps give you a 1600x1200 resolution, which is not as high as e.g. the Sony A7RVI and only about the same as the X-T5.
Second, "cheap OLED" doesn't equal "as good as any current smartphone screen". Worse, no screen the size of a camera will be cheap to produce because of numbers. The camera market is what, 100x smaller than the smartphone market? That by itself will inflate the production cost of the screen to the point where it's no longer interesting to use.
Don't make the mistake of thinking that a screen that costs €20 more will result in a €20 price increase of the camera. The price at which a device is sold, is typically 3-5x the price of the components. So adding a better LCD panel would lift your price by €100.