I don't think it's "the customer". I think it's you and some other folks who are in a relatively narrow customer niche who are very big on convenience and grew up on paper menus, making those feel convenient.

I'd add that the whole purpose of a restaurant isn't convenience for the customer. That's the purpose of going there for many customers, which should of course be honored. But the purpose of them for restaurateurs are generally on the order of "make an enjoyable living", which involves convenience for them too. As with almost anything social, the outcome must balance the desires of all involved.