I find the whole yellow paint argument to be stupid. Back in the day, level design was so spartan, that if you saw a ladder, you could resonably infer that you could climb the ladder. Nowadays level design has become so rich in detail that you need a way to differentiate between objects you can interact with and objects that are just placed for fluff.

I have wasted so much fucking time in games trying to climb ladders that were just decor.