

I’m with you on the attrition. I think some of the other readings are overly literal or unnecessarily harsh.
The way I see it, there is actual writing on the floor tiles. It’s in small print so you need to be close and it will be widely spaced. If you want to read the whole thing, you have to move along the whole path quite closely, falling into a few pits along the way.
The kill chance of the needle traps is only that high on paper. If the players are that high level and not expecting poison needle traps on every lock, they have been playing a different game.
I don’t know how it is in 1e, but in B/X there is always a 1-on-6 chance of spotting a trap and there is some paragraph about a trap not triggering 50% (?) of the time. From what I read, nobody seems to use that m, but it’s in the rules. I think that might be appropriate in this case, because it gives a chance that someone in the back line (or multiple people) fall in the pit at once.
I only have the OSE SRD to hand, not the actual B/X rules, although I understand that they are largely the same: https://oldschoolessentials.necroticgnome.com/srd/index.php/Dungeon_Adventuring#Traps
Searching a 10’ square takes 10 minutes, you have 1-in-6 chance of finding the trap (elves and thieves have more) - whole not written there, I would say this is for a generic search. If you’re doing something particularly appropriate for discovering the trap, the chance should be higher or automatic.
When you trigger the trap, there is a 2-in-6 chance it actually goes off.
Re: Needle trap: my point was exactly about skill based play: The Tomb of Horrors is targeted at experienced players, who would almost certainly see the needle trap coming, given how prevalent they were in those days.