This is an interesting piece. It reminds me of the quote "The reason reality is often stranger than fiction is that fiction has to make sense or it wouldn't be considered realistic."

The designer's concern that the game doesn't consistently give you all the information to inform consistent expectations from the game world is more of a stylistic decision than an objective flaw I think. One of the core appeals of dnd is that it's impossible to always know what to expect even down to random dice rolls. The game part is very important in dnd, but the roleplaying and emergent narrative are also very important.

If the player is taking it seriously and not save scumming, they are probably not going to have a perfect run and that's by design. What they will have is a relatively unique game experience with its own mix of successes, failures, and discoveries. If they want to be a murderhobo or munchkin they can and since it's one-player no one is going to mind. The game can flex into a tactical rpg or a relatively pure story experience as dnd can, but is not going to be the same experience as a chess game or a novel.