FormerlyHemlock
Hero
The # combats/day thing is ridiculous. Leomunds is a 3rd level spell that can be cast as a ritual and completely breaks that. So you say it only lasts 8 hours, and you can only benefit from one rest every 24 hours? Just 're-cast it and sit back down. What about wandering monsters - just pile up an army outside the leomunds to attack when it drops. Some situations ok, but wilderness or tombs where the undead or constructs are guardians. And in the situations that it does work, those wanderers are going to be around to attack whether you are sitting still or not. There just starts to be a real breakdown in the logic and feels like you are punishing the players for a perfectly reasonable use of a design features of the game.
Getting in a "free" long rest in exchange for having to fight every monster in the whole dungeon simultaneously sounds like a fair trade.

Also, enemies can do things like drop the ceiling on your Leomund's Hut to bury you in dirt, dig trenches around your hut, or tunnel underneath it. Many enemies won't do anything like that, but the ones who don't are probably ones you weren't too worried about in the first place. (Mindless animals.)
I agree with you about not punishing the players, and you'd probably be 90% safe at my table inside of a Leomund's Hut, but 10% is still a risk.