There is no technical difference. There's no real technical argument for it -- the same thing could easily be done by software. It's more about the gestalt of photography and being limited to a small number of options done "in camera". Most of what Fujifilm has been doing in recent years has been trying to carve out a niche closer to old-style photography (the XPro3's removal of the back screen in the default configuration, for example, so that chimping becomes difficult). When you pull files into Lightroom/Camera Raw/Capture One, there is tons of flexibility, but there's also a ton of sliders and it eventually ends up feeling onerous and not fun in the long term for me. (If I was doing professional photography it would be different of course.) I think that's a big part of what makes people prefer their phones.