Those big-ass different looking applications on desktop you mention are creator's tools. It makes sense they differentiate (specialize) their UX to deliver maxi

Those big-ass different looking applications on desktop you mention are creator's tools. It makes sense they differentiate (specialize) their UX to deliver maximum utility, especially important to carry it over a decade or more of OS design transitions. Of course they look different. Mobile devices are by and large meant for and used as consumption tools. So consistency is desired there.