Can you guess what is the basic flaw for me in AD&D, which eventually led me to walk away from it? How the game builds up expectations for the player.

The average person just flips open a player’s book, a monster manual or some other tome on the game lore and instantly the person thinks their character will be, from the start, like the model characters they’re reading upon, which they never will or even can be, as the game does not permit it, in my understanding and experience.

As a player, it was extremely frustrating to handle DMs that expected a newbie mage/ranger/fighter/whatever to take risks as if they were seasoned veterans and had high capabilities from the start. That is nonsense.

No class in AD&D is (or was; I speak from years of distance) capable of great feats from the get go, as the way the characters are built forces a level 0/1 into basically discarding any capabilities a trained individual into a specific profession would already have. It would be better to just say the characters are slightly above average commoners.

As a DM, I was quick to get fed up with players that wanted to pull stunts that would be barely feaseable to high level characters/professionals, regardless me going through the basics as I did above.

People are idiots but the game was set up by morons and others just tried to build on top of it to improve it, with mixed results at best.