I don't know if you've been to a (mainstream, chain, in a moderately normal part of the country) cinema lately but they're seriously doing a lot to address your concerns, with large, comfortable, reclining seats, cup holders, and digital projection if they can't support 70mm or IMAX.
The improvement in seat quality has come at a cost that I've noticed most cinemas in my area now have so little capacity - bigger seats with more legroom means fewer seats - that they have had to resort to assigned seating for more popular movies. My wife and I watched Wonder Woman during the afternoon and there were only five spots in the theater where we could sit together.
Which, I guess, leaves snacks, but I've yet to come across a cinema that'll search your bag, or, you know, you could forgo them and eat before or after you've seen the film.
I've seen various ups and downs in the movie industry. I remember how terrible theaters were in the 1970s when my father took me to see The Jungle Book, and a little later, Star Wars, watching the former on a screen that probably wasn't more than 2-3x bigger than the TV I have today. Things slightly improved in the 1980s, largely because all of a sudden the cinemas had money to spend on long needed renovations, but by the mid-2000s we were back to dirty cinemas with cramped seats and, in one cinema I went to, the smell of pee.
But we seem to be back to the cinemas doing something about it and revamping their theaters. I don't know how long this will last, but I like it.