I think the idea is that Fuji is specializing in smaller cameras. It's APS-C, so you get a smaller body and smaller lenses. If your primary mission is to photograph something, it doesn't really matter how big the camera is and the decision on what camera to use is all about semiconductor yield for the sensors ("full frame" is tiny, but easy to manufacture profitably). It's your primary mission so you'll bring whatever equipment you need to get the job done. This is a niche in the photography world; the vast majority of photographs are spur-of-the-moment cell phone photos, after all. Fujifilm sees more money in that market than specialist applications.
This camera isn't going to prevent the user from taking serious photographs. APS-C is big enough to capture plenty of data. I have a "1 inch" camera and really all 21 megapixels are usable at base ISO. The small size trades off the flexibility that an 8x10" camera gives you, but is easier to carry around. (It's harder to carry around than a phone, though, but provides vastly better images.)
As soon as you start moving into certain specialties in photography, certain models start making more sense. Wedding photography is about creating fine-art shots in a sports photography environment, so the professionals are using high-end "enthusiast" cameras to great effect. The autofocus gets almost every shot. The metering is always correct. Those cameras don't trade off speed for detail, so you can still make nice 8x10" enlargements that look fantastic (but maybe not take 30fps bursts as sports/photojournalism cameras might).
Other specialties are cost-constrained right now. Nobody wants to take their macro shots with a DSLR, but Phase One backs are $33,000 for your $10,000 view camera, and hobbyists don't have that much money. (It's even expensive for the pros, very much a pricing based on semiconductor yield rather than the time cost of not having one.) Hence they compromise by spending 8 hours in photoshop working around the limitations of their camera, or just use film.
If you don't care enough about the results to do either and are only going to buy one camera, an X-T2 is just as good as anything else. Carry it around to take excellent spur-of-the-moment shots, snap that nice landscape, use it at home to take some pictures of that bug you just killed. It's as good as anything else. (Upgrade to a D810 for a few more pixels and a lighter wallet.)