They end up doing that anyway as each fights is tooth n claw. I hate cuddly games where death is no option
Its your game mate, but 5E is more a game of longer term resource management. Gradual attrition over a longer adventuring day, with 2 short rests given out every 2 or so encounters.
The Dungeon masters guide says the following about adventuring days:
The Adventuring Day
Assuming typical adventuring conditions and average luck, most adventuring parties can handle about six to eight medium or hard encounters in a day. If the adventure has more easy encounters, then the party can get through more; if it has more deadly encounters, they can handle fewer.
Although you can never be certain when players will choose to take a short or long rest, you can build in natural break points to guide the flow of the adventure. Let’s say you’re designing a dungeon and would like a resting point for the players before they move from the first level down to the second. You can stock the first level of the dungeon with encounters of the right challenge so that, around the time they finish exploring that level, the characters’ resources are depleted to the point where they need a long rest. Thus, the adventuring day would naturally end at around the time the party finishes exploring the first level of the dungeon.
A 'medium' encounter is one the PCs are expected to win, expending only a few resources (a spell slot or two, some hit dice, maybe a rage):
Medium:
The encounter presents some difficulty, but in the end the adventurers should emerge victorious. Medium encounters might require the characters to expend some resources or heal up a bit after the fight.
A 'hard' encounter might (small chance) kill a PC if they are already weakened, and the PCs have bad luck:
Hard:
A hard encounter is tough, and it could potentially go very badly for the adventurers with a few unlucky die rolls or bad circumstances. Weaker characters might get taken out of the fight, leaving a few adventurers to deal with the threat. Hard encounters have a small chance of killing PCs if things go awry.
Remember - in a standard AD, your PCs are expect to encounter (and defeat) 6-8 encounters like this (getting about 2 short rests in after every 2 or so encounters) before long resting.
This should be your default AD (for around 50 percent of your adventuring days).
If the'yre getting less encounters or less short rests, youre punishing Warlocks, Fighters and Monks, and significantly buffing full casters, Paladins and Barbarians. You also encourage nova tactics, meaning you have to increase the difficulty of your encounter even more (further adding to the problem of throwing class balance away, encouraging nova tactics rather than dissuading it, and increasing the chances of a TPK).