Crimson Longinus
Legend
Nah. I've constantly said to low monster HP is preferable not raise fighter damage.
But the community doesn't want major changes as they don't want to learn new rules or adjust old content. So increasing fighter/barbarian/ranger damage is the only option "allowed".
But my preference from jump is to
It's all about the fantasy. D&D should fulfill the fantasy. Especially since newcomers will come expecting that fantasy from other media which inspired their fighter PCs. And there are ways to do it with overwhelming new players.
- lower monster HP. Either remove CON mod bonus to HP (Vampire Spawn goes from 82 to 49) or roll monster HD as 1s (Vampire Spawn goes from 82 to 33).
- Assumption of using magic items and feats at all table.
Do something. Do anything. But the "5e fighters can't cleave through enemies so it okay" is just cope. It ain't right and excuses are being made.
Then lower the monster HP and see how it goes. I just really don't feel that is needed. Stuff not dying fast enough definitely is not an issue I've had in 5e. Monsters often explode before they can do anything.
I don't think killing stuff being too hard just is an issue most people have with 5e, so I wouldn't expect an official fix to this problem that most people simply do not have. I feel you're again generalising your own expectations to be the expectations of the community as a whole.