FormerlyHemlock
Hero
One might imagine a single use of the spell in this fashion wouldn't be abuse. When it grows tiresome and no longer entertaining through abuse, then it's a problem for achieving the goals of play.
You're begging the question by tacking on "through abuse." Which of your goals does it conflict with? It conflicts with none of mine.
It's certainly possible that sitting in a fortress could grow tiresome, and tiresome activities should not be gamed out. Once they've got a hut up, the player's are moderately secure against attack, and they control everything within their line of sight up to the limits of their effective range. At that point, monsters need to give up, tunnel under, fly over, or go around. That's not abuse, that's just the reality of siege warfare. If I as a DM make the players roll every single attack roll against whoever is in their hut, the responsibility for tiresome play is on me, not on the players. Outcomes which are not in doubt, or with no meaningful consequence for failure and no restriction on repeated attempts, should not be rolled. They should just be narrated.
Maybe I'm reading too much into your statement. If you're just saying that you expect players to be sensitive to other players' feelings (including boredom/shyness/envy/etc.) on the social level, that's a valid point. If you're saying that you enjoy running certain kinds of games and expect your players to play along, that is also a valid point. Those things apply equally to Leomund's Tiny Hut, Action Surge, and Fireball. None of these things are cheesey in the same way as Crossbow Expert cheese (tendentious reading of the Crossbow Expert feat to grant maximal advantage to the player who takes it), they're just features of the way the 5E universe works, and they all have potential to make other characters feel left out or to make certain types of encounters easy when played a certain way. That's not abusive, but it's valid for you to dislike them anyway and want to exclude them from certain types of games.
TLDR; it isn't abusive for a PC to use the tools they have to stay alive.