Having a few foods (eg, mushrooms) that you dislike is one thing, but being the kind of person who can't eat out except at a few tpyes of restaurant or who can't roll with what he/she is served while a guest, traveling, etc can really be a problem. It could even limit you in the employment world. I have known people like this and it seems hobbling to me.
Whicb is not to say a child will be like this as an adult if he/she is limited in diet at 3, 5, 10, even 16. I also know a lot of former picky eaters who now eat broadly.
ABSOLUTELY.
I say that as parent to someone who truly--
cannot do those things.
To not worry about "will not" seems kind of crazy to me, honestly. I get food aversions. I do. I have a few of my own. But being intolerant of even being served some things on that basis is... (IMO) unnecessarily limiting.
I know a great many adults (the majority, in fact, of white collar people) whose employment
requires the ability to roll with group dining decisions (restaurant choices, etc).
Flexibility here is a good thing. Something to be
cultivated (note that I do not say "forced" because this is a power struggle that a parent cannot win) and not ignored, for sure.
ETA: I
truly wish people would NOT conflate allergy with preferences or even aversions, and they do it all.the.time. For DD, I don't cater to her complete loathing of mushrooms the same way I do her food allergens, and I don't ask others to, either. She can deal with it politely and unobtrusively, IMO.
I mention this only because the human tendency is to get
fatigued with special food requests...
Consider the sheer number of food quirks in a group of just 6 or 7 people, and a "good" host might be left thinking "no tomatoes, mushrooms, garlic, onions, pasta, hot/spicy, soy, seafood, cauliflower, chocolate, nothing fried, must have vegetarian and low-carb options, oh and one kid only eats PB+J."
Assume for a moment that ONE of those people has a life-threatening allergy... to garlic.
So from my own perspective, all of the additional "noise" there makes error far more likely. Most people without personal experience of food allergy assume that they're
all just preferences, or that traces are fine.