Remathilis
Legend
I was responding to the comment that players in 5e ‘know’ they can beat everything because the game is level capped to the party.
Modern D&D (3-5e) define what is a deadly encounter. In theory,
This still seems like OS and NS are getting to the same place and claiming that took different routes.This still reads to me like a misunderstanding of how OSR type games are played (or at least how I play them).
1st - The level two party can choose to go to level 8 (or a location that has level 8 type creatures), but if there's a "level 8 creature" (Say a mature red dragon) in a room on dungeon level 2 it won't exist as a sudden "Boo - I'm gonna fry you and eat you for not looking through the keyhole" type encounter. It will likely want something from the PCs and offer plenty of clues to its present (e.g. the berserkers nearby worship it, there are huge claw marks by the entrance to its cavern and shed red scales...)
2nd - In the second case (level 8 of the dungeon) the risks are huge and the players should know that - they will be super cautious ... but then they also decided to go somewhere way too dangerous for them! Knowingly. they want to play that kind of game - risk everything on a chance to bring back the big treasures etc. That's of course possible as the power curve in OSR and some older systems tends to be flatter. This is not a design issue though - this is daring players.
3rd - Taking too long, checking everything with 10ft poles is the worst way to do go into a super dangerous area. The random encounter check will get you. A level 8 dungeon might have vermin with 5-6 HD... So move fast, take risks, run away and sneak about and only use up time to check things you're really sure are necessary. The random encounter check always acts as a counterweight to player caution.
The OS DM decides to design a dungeon with a level of two. He uses monsters appropriate to that level (orcs, gnolls, an ogre, etc) and treasure appropriate to that risk. The OS DM decides also to include one monster wildly OP to the level as a potential RP scenario. He then places it in an appropriate part of the world and gives players hooks and hints that the place exists and approximately what power level it is and lets the PCs decide effectively (we're level 2, we should go to the dungeon the DM telegraphed is for level 2.)
A new school DM decides to create a dungeon for his second level party. He stocks the dungeon with easy, medium and deadly encounters appropriate to level 2, with appropriate treasure, and then gives the players a hook to go there.
In both situations the DM isn't willy nilly designing. There are no mind flayers living next to kobolds, no ogre guarding a vorpal sword. The difference is that the OS DM decides the the Abandoned Abby is a level 2 dungeon regardless of what level the PCs are and telegraphs that accordingly and the NS DM decides the Abandoned Abby is a level 2 dungeon because level 2 PCs decided to go there. To me, that's a chicken and the egg scenario as long as it ends up with level 2 PCs in a level 2 dungeon.