Dragonblade
Adventurer
hello, i am a player in the original game and i want to clarify the problem as i see it.
The problem is not that fights are too easy, indeed we drop below zero very often.
The problem is that once you go to zero there is no risk of death... in general players don't feel it is needed to go help your fallen comrade since it is more efficent to deal with the enemy quickly and then tend to your wounded...
sure bad guys can quicken the death with coup de grace and so on but if i was a monster i'd rather take care of the living threats than wasting actions onto uncouscious enemies...
You've solved your own problem. Reduce the number of death saves to two or even one.
I also think your group is also over-rationalizing why a monster wouldn't attack a fallen foe.
When I run monsters as a DM I always play it from the monsters perspective. For some monsters it doesn't make sense to keep attacking a fallen foe. This might be true for say goblin soldiers or skirmishers. But if its a green slime or something unintelligent that only wants to eat, then darn straight that monster is going to ignore the other PCs and focus on its tasty meal. Same thing with undead. They don't feel pain per se, so unless those other PCs are really focusing on saving their comrade by fiercely attacking it, its going to start feeding and let the other undead attack the other PCs. Or at least try to drag its meal off somewhere where it can start feeding.
Also any monster that can gain some sort of bonus or sustenance from inflicting a condition or somehow life draining a fallen PC is going to focus on the fallen PC. They don't fight back and they can just keep draining them dry.
Likewise, area attacks can be really nasty when there is a fallen PC on the ground.