Reynard said:
what would the reason for their exclusion be?
Ease to differentiate play style.
To fully remove save-or-die stuff from the game it has to not be an option for both the DM and the players. This means that it should be listed on the house rules at the beginning of the campaign.
Okay... So what does "No Save-or-Die Spells" mean? Unless there is a classification along the lines of [GOOD] and [MIND-AFFECTING] it would require a list of spells. A list that would need to be updated as each new book came out.
I would have no problem with WotC making a book called something like Legacy of Lethality which included a buch of Save-or-Die spells, feats, abilities from substitution levels and craetures. Those who want Save-or-Die effects can add in the book and those who don't can say "No Legacy of Lethality" on the house rules document.
I'm a player and not a DM. I don't want Save-or-Die for two reasons:
1 - I have sat out of hour+ battles because I was taken out early. The ones that come to mind I can't be certain if it was because of SoD effects or because I got pounded on very early. I know of other players in our group that were taken out for long stretches of time because of SoD effects. It was boring (for me and I could tell that the other players were bored); very... very... boring.
Sure, other stuff could take me from full to dust in a single round; crits, high damage spells, 100 first-level wizards all casting Magic Missle at once targeting me and so on... If the DM wants to kill me in one shot the DM will be able to. There is no getting around that; but removing SoD will lower the chance of me being able to catch up on sleep in the middle of a session without missing anything.
2 - It is true that I'd rather not die from a SoD but I also don't want the BBEG to go down in one hit. That is boring as well. My PCs have been saved on a few occations by the Big Nasty Critter rolling a 1 on their Fort save. After the huge sigh of relief I always find myself thinking that it was actually a boring encounter. When I'm talking to the DM my favorite fights are the ones where we as PCs had to work for the victory - the exciting fights where it could have gone either way. If I've been twiddeling my thumbs for a half-hour the fight doesn't qualify. Call me odd but extreme bordom doesn't make a fight 'exciting' for me.
Contrary to the popular phrase, I don't play D&D to "kill things and take their stuff". I play D&D to "beat things down, kill them and take their stuff". Outright killing them skips that all important first step.