I recall in particular when I first moved to London and realised you could identify low quality Italian restaurants by whether they had the same laminated plastic dessert menu from some distributor of ready made desserts... The step up was when they'd cut and pasted parts of that menu design into their own template...
And keep in mind we notice the bad examples, because they stand out. They'll fade out of public consciousness as people get better at getting better output out of them, but they're not likely to disappear - menus have clearly been a low priority for a certain subset of places pretty much forever.
If anything, it reliably signals "cheap".