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Questioning why you have giant robots, pointing out the square-cube
law, or that mushrooms are a too nutrient-poor food source for a
troglodytic subterranean race, is usually met with an angry grunt, or
otherwise snarky comment.

You perfectly can have everything you want in your world if you make the laws allowing it.

You can choose current laws, modified laws, magical laws.

Even with current laws, you can have a troglodytic subterranean race eating mushrooms and insects, living in great cities and having millenia old empires. Ants

I get what you are saying, that the world should hold coherent by itself and I agree.

But for realism you will always have to tell a story relatable to humans and sometimes a story about humanity is better told with fluffy talking rabbits than with a detailed plan of the universe

Of course, your talking knight-rabbits of Reticula 6 should avoid going after Black Beard's treasure, consistency towards genre is as important as consistency towards inner laws

Genre's general laws, physical laws, magical laws, never lying to your reader, they are all important to maintain suspension of disbelief and on that we perfectly agree.

I take worldbuilding as a special part of storytelling, a part specifically trended towards imagination and playing with rules, and while I do agree with you, what I like in worbuilding is making new rules and trying following them, you can't handicap your imagination by sticking to reality and believable things, that's not why anyone is here.

But I get you :)