It is artificial because it relies solely on luck.
No matter if you cleared the dungeon or not, no matter if you are in a locked room facing the door, sitting in the corner, no matter if you've set traps you'll get ambushed.
Well this time game check was dungeon cleared or not thats can be used to decide was become area secured or not, seems you cannot set traps again unless there will be mods thats allow such feature.
It takes no skill, no preparation, just luck.
And it is still easily, but annoyingly avoidable by moving away from the dungeon, moving to another room or outright save-scumming.
Does regeneration require something then?
It even don't require luck and simple work as constant and free health restoration without of any requirements, I hope at last broken Oblivion waiting was fixed and it will no more restore all to maximum if you simple moving away from the dungeon, moving to another room or just hide with low duration invisibility to be undetected by enemy specially for activation cheat waiting.
And for the rate, it needs around a minute to get from 1 to 100 from what I've seen on level 1.
So compare it with spell of similar effect
Restore Health magnitude 1 duration 60 seconds will cost you 84 Magicka points for cast now you will have it for free and even more with constant effect without of any magic attached, oh well in previous games such powerful effect require good search like Necromancer's Amulet what have Arch-Mage Trebonius Artorius for example.