This is simply not true. PCs OFTEN don't moves as fast/ or at least not faster than opponents.
That assumes the monsters
must chase them. That's simply not true. The DM can always have the monsters
not chase the PCs. Just as the DM can always have the monsters
not kill the PCs. If it makes sense for the monster to do those things, do them.
The DM needs to consider fleeing as an option or it may not actually be a viable one.
As long as there's an exit, it's viable. Surrender is also always an option.
Partial TPK just means short of a TPK like 50-75% of the party dying.
So not a TPK, then. Got it.
More often than not death just means rolling up a new character - which ok. A TPK just means everyone rolls up a new character. There are plenty of more fun/worse consequences than that.
An infinite variety. One of which is
both killing the party
and continuing to use those characters. There's a lich. It has
raise dead. There is an underworld, many of them more than likely. Death might want something. Like maybe the pesky necromancer lich to stop taking all these people out of the underworld. Having death be the end is simply not using the fantasy milieu to its fullest.
The DM still has to know how easy or hard the task the PCs are trying to accomplish is. You can't react if you have no idea what the PCs chances of success/failure are.
One simply doesn't follow from the other. The DM can have the stats of the monsters and use them. The PCs have their in-character and in-game knowledge of the situation. The fun is seeing what happens next. I don't need to know ahead of time that the party has a 37.9% chance of victory before they engage with a fight.
You're describing a true sandbox. Not all, probably not even a high % of games are run like that.
Sure.
Further, even in a true sandbox, the DM MUST know the relative difficulty of any given challenge.
Patently false.
The situations you describe are obvious, but most are not.
The situation the OP is describing is obvious. If the PCs decide to last stand that fight, it's on them.
If the DM doesn't telegraph that certain encounters/situations are WAY above a groups paygrade -then cackles manically as they're brutally killed? that's not a good way to go.
Agreed. I never said otherwise.
Literally anywhere the deadly fight is not. You know,
away.
just because they can run, doesn't mean the opponents won't follow.
You mean the opponents that the DM controls? Yeah, hint: the DM controls them. Not following the PCs is absolutely a viable option.
Sorry, but a DM that builds a situation where the PCs are certain to die? That's a complete jerk move.
And no one's claiming otherwise.
It's basically a power fantasy where the DM may as well just read the outcome and not bother having the PCs even roll dice. A possibility of death, that's part of the game. A likelihood of death, as long as the PCs know what they signed up for - that can be great fun. A certainty of death - why even bother?
Likewise, a certainty of success and everlasting life...why even bother?
That's a little reductive though. Not everyone is going to understand that the swing of a d20 is pretty big and that the range of possibilities may exist outside of their expectations. In my opinion, one can never be too careful about setting expectations ahead of time both in games and in life. It avoids a lot of issues downstream.
Even if it's reduced to the binary options of success or failure, you still have both as possibilities. I mean, I don't know what to do if someone cannot comprehend that failure is a possibility. I agree that with a lot of modern players, especially ones in my games, you have to literally explain to them that failure is a possibility. I'd somewhat naively hoped it was limited to my table. Clearly not.