Two reasons, actually.
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It’s not their preferred preparation. All the replicated food is based on a pattern from an original recipe. It’s not adding flair or anything, it’s literally a copy of a dish made who knows how long ago. And that’s where the next reason comes from:
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Imagine eating some spicy pepper dish from, like, the 1940’s vs the same dish made today with spicer peppers. It wouldn’t be as spicy eating something that wasn’t, at the time, really selectively bred to be more spicy. If the recipe for the replicator is, like, hundreds of years old it would probably not be as potent as the same dish made with real ingredients.
I can imagine that the characters that have expressed disdain for replicated food probably get hit by both of these. It’s not the way they would preferred it to be made, and it’s also like eating vegetable jello salad in 2024.
<will it pass muster to be aboard the ship in the first place? Starfleet has standards, after all.>
I was under the impression that crewman are free to add new things. Like Data, who composed food for Spot and I believe there were several instances of tinkering with the replicators on VOY and DS9. Although DS9 maybe is the odd one out, since it’s , ex-kardassian and co-owned by Bajor, and a certain ferengi runs a bar there. ^^