So do Sony users cope mostly by using alternative company lenses adapted to the NEX like Canon, or lenses used manually?
To get back to the original question...
It really depends on YOUR needs (not the needs of anyone else).
There ARE great native E Mount lenses., despite what photozone or other websites might sai. I think in a couple of reviews Photoszone noted that they may have / probably got a bad copy of a lens for review (that might have been for some FF lenses).
I used my a6300 and 10-18 for my commercial architecture and real estate stills and videos. Wish it were a bit sharper, and while the AF is quite quick, in lower light (say, in the kind of light where I would shoot at 1/10th at iso 100 and f/7.1), it can have trouble acquiring focus unless you pick an area to focus on that is VERY contrasty. My D750 on the other hand nails autofocus in those situations.
I have the 16-50, and I love the convenience of it on the a6300, but when I get home to look at the shots, I usually ask myself, "Why didn't I just use my smartphone?" It is a pretty good lens in bright light - or shooting stationary objects - when you can close down the aperture a bit (like two stops).
There are a couple of SSM lenses for A mount that can be adapted to the a6300 and other E Mount cameras with the appropriate Sony LA-EA1 / LA-EA3. I just picked up the 85mm f/2.8 and am still testing it out. Seems to have a bit of back focus (to me) which seems weird since it is using on-sensor AF, which is supposed to prevent things like back and front focus.
Then there is the LA-EA2 and LA-EA4 which some people use with sony and Minolta lenses
Then there are various other other adapters that allow SOME functionality of various lenses, depending on the capabilities of the adapter.
Some of us use two different camera systems (I have a Nikon D750 and a D700 and a small handful of Nikon glass), and I end up lugging along both systems on commercial gigs. would love to dump Nikon and shoot all sony, but still waiting for the native e mount lens lineup to fill out a bit, and waiting to see if Sigma / Tamron / Tokina commit to making E Mount FF lenses.
Again, if you have the money to afford the lenses AND they fit your needs, then I would strongly suggest getting native E mount lenses. Love Eye AF, Love the convenience.
But if you don't have the money for the lenses or you don't see a lens that fits your needs, but you love the NEX 7, then there ARE alternatives, although none of them are great and they all involve sacrifices.