You must not use your X-T1 much ...
There are tons of ways to improve the X-T1. Better build quality would be one (peeling rubber, non-sealing accessory door, rubbing paint, loose tripod socket screws, loose lens mount, mushy buttons (solved)). There are many many ergonomic improvements that could be made. Like making the lock buttons switches instead of buttons, moving some of the fairly useless dials back to programmable buttons, implementing a better Auto ISO, making the grip a little deeper and the rear button layout closer to the more useful ones (see X-Pro1 and X-Pro2).
There are also a whole bunch of software bugs in the firmware that should, over time, be fixed. The menu layout is pretty bad, the camera should also have +/- 2 stops and at least 5 shots in exposure bracketing, better ISO performance and more control over noise reduction at high ISO (skin waxing), better auto ISO when using different focal lengths (shutter speed as a factor of focal length, not just a fixed number), multiple auto ISO settings, custom settings that can be named, more things being programmable via custom setting like face/eye detect, exposure mode, flash mode, ...
And that was just a quick run down of things that are not ergonomic, slow, or just plain bad in daily use. No long and hard thinking required. The X-T1 shows very well that Fuji had still a lot to learn when they brought this camera to the market.