Lots of chips are flour-coated, too. There areoften unexpected challenges for people who are coeliac or allergic or intolerant to some ingredient or other. Allergies to things like allium (onions, garlic, chives, leeks,) or solanaceae vegetables (tomatoes, potatoes, aubergines, bell pepper, chillis,) and things like that must be challenging, as they're all over the place.
I think there are more allergies than there were say 50 years ago. I suspect also more people survive - now we have epipens, but at one time, rarer as anaphylaxis was, people would be less likely to have survived anaphlactic shock. Children with Y1 diabetes just wouldn't have thrived before insulin injections and the ability to check blood sugars were available, and would be less likely to have survived a diabetic coma. I think it must be easier to be coeliac than it was for my aunt when diagnosed in the early '60s.
We have much more awareness of various conditions now (as well as high prevalence.) I think it's a good thing that people who are allergic, coeliac, whatever rlse, are catered for. With a bit of imagination, most dietary needs, whether for a health condition or religious can be catered for. I agree the 50% vegetarian thing is a good rule - most people can eat salads and so on. A good buffet should be able to cater for everyone.
I do agree that people who do things like insist on gf and then scoff all the Danish pastries are taking the piss, though.