Id say that the biggest problem is that the dmg section quoted by
@Maxperson really only applies to tier1 PCs and breaks down as players move through tier2 into tier 3 levels.
Take the monk & warlock as the prime examples designed to enable 5mwd loops.
I've been running high level characters for a while (currently 16th level), but I do not have any monks or warlocks.
In fact I've banned monks outright, but that was a thematic preference and because the 1-time I did allow them to the min-maxer of my group, he just created the most annoying character that I just said once and for all this class will never see the light of day for players.
The warlock is an even bigger problem getting both spell slot level scaling equal to regular casters and tend to finish a long rest with slot numbers equaling or exceeding what regular casters have of that slot level as if they are pegged to the slot count numbers of ad&d2e/3.5 casters. In tier1 & early tier2 it's not a huge deal if they squeeze in an extra rest but by the time they start the day with 2-3 4th or 5th level slots and regain them each rest it very quickly becomes obvious how lacking GM tools are when players are still expecting the super generous rest availability of the early levels when PCs were killing rats in the basement equivalent quests.
I understand. Our table has HD spend which means the PCs can (and do) push and you can imagine at their level, with their amount of HD they are a powerhouse, which I do not mind for a number of reasons.
- I'm happy for their characters to shine;
- I enjoy playing the attrition game;
- Monsters are appropriately suped up and I can go hard on the PCs;
- Long Rest is 24 hours in a safe and comfortable space but more importantly the campaign fiction has a built in time constraint right now which demands players maintain a necessary pace for the storyline;
- Sanity, Lingering Injuries, Madness, Exhaustion, Traits, Touch Attacks as well as other mechanics work well to provide challenges.
House rules to fix the absolute failure of design and outright disdain wotc has shown towards the idea of supporting GMs on the matter because players with that video game mentality who believe they are entitled to generous short rests will simply view any meaningful infringement on rest availability through house rules as evidence of stereotypical evil/killer gm behavior
@Maxperson mechanics that support the GM in limiting excess and the advice is pointless because of the reasons described above. The rest rules themselves provide extreme support in resisting a gm who is unreasonably restrictive but when it comes to the idea of players with short rest classes having an unreasonable expectation class design wotc & the ruleset itself does not even acknowledge it as
possible for the players to have an expectation of excess.
I can see why this is an issue.
I find this more to be a table issue than a rules issue (despite the design flaw in Rests).
There is a reason why in the 2014 DMG part 3 is called Master of the Rules.
There is a good reason why a DM gets a whole book to himself.
If you (as a player) are not willing to work with the DM for an issue that may arise then I'd boot you from the table.
If I as DM am prepared to work with the player for their character's specialness, they should meet me halfway then when it comes to rules and not act like spoilt children. And this is not to say I'm some sort of tyrant, we often make decisions as a table when something comes up - cause I'm dealing with peers and many heads are better than one when you're fixing something.
I see this very black-and-white especially because of the way you are describing it.
I count myself extremely fortunate I have amazing players with a similar outlook on the game.