You’ve wondered I’m sure. I have. Why are restaurant websites so horrifically bad?:

…The rest of the Web long ago did away with auto-playing music, Flash buttons and menus, and elaborate intro pages, but restaurant sites seem stuck in 1999. The problem is getting worse in the age of the mobile Web—Flash doesn’t work on Apple’s devices, and while some of these sites do load on non-Apple smartphones, they take forever to do so, and their finicky

…

I did get a plausible-sounding explanation of the design process from Tom Bohan, who heads up Menupages, the fantastic site that lists menus of restaurants in several large cities. “Say you’re a designer and you’ve got to demo a site you’ve spent two months creating,” Bohan explains. “Your client is someone in their 50s who runs a restaurant but is not very in tune with technology. What’s going to impress them more: Something with music and moving images, something that looks very fancy to someone who doesn’t know about optimizing the Web for consumer use, or if you show them a bare-bones site that just lists all the information? I bet it would be the former—they would think it’s great and money well spent.”

Not ...