problem with that "supposed to" is that by limiting long rest casters to so few spell slots you push the group to rest after every fight & massively inflate it towards 6-8x their level rather than 3-4x. That has dramatic effects that should not be discounted and can't be ignored once your game turns into literally every round the monk saying "I'm going to make my first attack, flurry on the second attack & make one of those stunning strike"I really don't see these as problems. As mentioned, monks are supposed to have 3-4 times their level ki points over the course of an adventuring day. On the assumption that there are two fights between short rests, that means monks are supposed to use an average of level/2 ki points per fight. Assuming 3 rounds per fight, a 10th-level monk can flurry each round and attempt two stunning strikes between rests - if they do nothing else with their ki.
As for fighters, I don't think they need to be encouraged to take short rests because they all get Second Wind and Action Surge, even if some subtypes get more benefits from a short rest.
For a moon druid, getting "knocked out" in a wild shaped form means they lose the form and take the spillover damage. They can still continue to cast spells and cantrips or attack with weapons. I actually think it would make the fight more interesting if the wild shaped druid PC has to change tactics halfway through.
edit: Moon druid really doesn't tend to "cast spells", all of their spell slots tend to go here
So the moon druid gets knocked out of form because they don't have most of their arsenal leaving them with nothing but poor attack cantrips & the monk has virtually unlimited ki. That druid's going to have a legitimate case for being extra salty about it. With the fighters, imagine one playing a champion/cavelier/etc that just gets second wind/action surge while another fighter at your table has a bunch of cool stuff they get back like every fight.... that more log rest fighter too is going to be justified in their eventual frustration over the imbalance created by the change that makes them no longer up to par.
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