I can add my own anecdote to this one. One of my cat’s is fine with any bowl because he’s just very food motivated and will do anything to get to his food at feeding time. The other one, when using a more narrow bowl, would often stop eating normally and scoop out the food with a paw. Once I switched to wide flatter bowls, she scarfs it down without pause. It was clearly bothering her.
While cats vary in their preferences and tolerances, it bothers me that so many people just scoff at this idea. We’re caretakers for cats and should do our best to make their lives as reasonably comfortable and enriching as possible. And just because a cat is fine with touching things with their whiskers in some situations doesn’t mean they’re cool with it in others. Cats are often happy to have you scratch behind their ears, but only when it’s invited.
And come on, bowls are cheap. It’s not that big of an inconvenience to get them a bowl that could be more comfortable, even if they’re tolerating it now.