I was recently reading an older RPG and came to a part about "script immunity". Basically, the PCs aren't supposed to die unless it is necessary for the story being told. It got me thinking about something that has bothered me with D&D for a while now (particularly in 5E). I feel like the PCs aren't supposed to die, and I have heard how several groups now house-rule TPKs turn into captures, or the "it was all a dream" fake-out when PCs die, etc. Many DMs don't like bad luck killing off a PC unless they were doing something foolish (I've been in this position before as DM).
I know D&D is not about "winning" or "losing", but about the adventure, challenge, and story being told. However, lately I feel like a story that is already meant to be "successful" or "won" is not worth the telling. I have no interest in running a game where the players actually expect things to be ok. Where is the excitement if they believe the PCs will be ok--somehow...? Even if you have other goals where the PCs fail--it might not be heroic--but they are still there to try again.
I also understand most players don't want to invest a lot of time and energy into a PC who can die at any time. There are several reasons why it can be disruptive to the game, as well. But I have found IME that this leads to players taking chances which border on foolhardy, valiantly going forth instead of taking the time to plan, investigate, etc. a situation.
I once was part of a team developing a RPG called Mortality, because it was very lethal--combat should be avoided whenever possible. But D&D is so very combat-oriented at most tables a very lethal version wouldn't be well accepted IMO.
Anyway, these are just some thoughts and I was wondering in anyone else is experiencing similar things. Thanks for your time and any responses.