Sure, but the content is there to obtain high valuable gear. It should reward differently doing high m+ keys or raids than WQs. Imagine for a second what would happen if everyone could fly around DF picking up ilevel 420+ gear from WQs. It would most certainly lesser and devaluate organised group content that require much more than mount up->fly to WQ->climb a mountain->obtain ilevel 420 gear.
Now, Blizzard could add really hard solo WQs that rewarded highly desirable gear, but lets be real. If they did that people would come to the forums and cry endlessly for having to actually play decently.
I think, for the most part, alot of players just want to have easy-neverending-grinds that in some shape or form give character progress/power. They dont want a challenge, they want something easy to do, that never really stops.
No idea why really. I have a alt that is bad geared compared to main, but even with the alt im blasting everything down in the world. This all screams "I want BiS without talking to anyone, coop with anyone and it should be easy enough"