To make the point that people should be more open to the idea that may be the mechanic is just bad and that there's better solutions out there by getting to the root of the problem (ie, shoehorned and unfun Survival mechanics) and addressing it from new avenues rather than just trying to glue Humpty Dumpty together just right.
TBF, the mechanics in D&D have mostly been pretty bad. Classes have been bad from the get-go, they limit the characters players can bring to the table. Powerful spells 'limited' by being 1/day (when you can have more of them than you face encounters/day),
bad. Stacking bonuses,
bad. Single-target, multi-target, and multi-tap attacks all being possible in single action,
bad. Even the d20, itself, as a linear distribution,
bad.
And, yes, rests of a prescribed duration, bad. Also, scrounging for or using make/buy for consumable items just to survive? Bad. (Sorry but seriously, 3.x already did that, see the above WoCLW/LV &c comments, and, like, as annoyed as I was when D&D was compared to WOW, under that paradigm, it'd be legitimately compared to
Gauntlet)
Nor is that list exhaustive. (in another thread, "what do you actually like about D&D," I responded "hit points" - that's probably the only mechanic in D&D that actually provides enough simplicity
and genre emulation to make up for the knock-on problems it contributes to)
If you allow yourself to step back and dispassionately judge D&D, you can only conclude that it's a bad game, through and through, completely irredeemable, un-salvageable, and no one not already acclimated to it through decades of suffering, should ever be subjected to it, just on, like, the grounds of basic human rights.
(It's too late for me, save yourselves!)
edit: I tried a little humor to soften the ol' cynicism/fatalism/pessimism/sub-clinical depression/whatever that has always been one of my signatures, there, but D&D isn't a game that we play because it's good, it's a game we play because we played it for so long in the past, or, if you're not a Grognard, that you try because you've heard so much about it.

Like, an acquired taste. (I have a few of those, really - D&D, lemberger, imperial stout, rye (the bread & the whiskey), sushi, Ed Wood
films movies, and so forth). I don't insist anyone else have the same list of bad things they enjoy, I just expect to be left to enjoy them, myself - and hope they don't become too hard to find.
(no worries on the D&D front, but, lemberger... you'd think, in a big, flush, foodie community like Silicon Valley, you could find a not particularly exotic cheese, but no, only Whole Foods has it, they get it in on a weekday (when I'm working), and by the time I can drop by, they're sold out - WTF, Whole Foods? Can you not keep a little extra on hand? It's not like, if you let it sit in a refrigerated case an extra week, it'll start to smell
good...)