I suppose if I was a fulltimer, I would appreciate a manual awning, as I could put it out once, tie it down, and leave it there. But who wants to do that, if you have to put it up an hour later, because of rain or moving on to the next camp site.
I have always had manuals before, but now really appreciate my electric one. I have found we use the electric awing much more now, than the my past manuals. So much easier to just push a button and use the awning. Putting the manual out was rarely worth it, unless I knew the weather was guaranteed dry...plus, I would never leave it out at night, for fear of getting big winds or rain.
Plus, I would never leave my awing out in the rain, unless I knew was going to be able to leave it out for an extended time to dry (which is rare when traveling from one campsite to another). Otherwise, rolling it up with any wetness will guarantee mold.
Because of the above reasons, I have found the electric awning convenience allows me to use it much more.