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This sounds like over estimating a lot of restaurants ability to handle electronic menus.

I don't think I've seen that functionality in many restaurants at all.

There is always a cost in updating the menu.

A case in point:

https://www.sixteen-nine.net/2019/08/15/paper-and-tape-are-n...

An electronic menu can also have prices that change every hour based on how busy the place is or even have prices based on demographic information gleaned from the user's phone.

What restaurants do this?

International House of Hypotheticals, Strawman Cafe, and the Red Herring Bar and Grill.

+1 for you, sir

Great now i want to go to a fish grilling bar.. Thanks a lot.

None that I'm aware of, but it WILL happen.

I see your point but I've been told so many times "sorry sir we're out of salmon and eggplant" and nobody seemed to care except me regretting the salmon and eggplant. So, not sure it's a real world argument.