How to succeed at adventuring according to Gary Gygax

I just looked through my copy of the 1st ed PHB. In it are described some tips on how to be successful at adventuring. Apart from the importance of having an objective, is also mentioned that having two maps is the key to success. One map could get destroyed by a fire ball, or some other environmental hazard. It brought home to me the idea that the player's map is not just a help for the player's memory, but also an object in the game. The advice is actually something I recognize from the first place I read it, in the Swedish game Drakar & Demoner. Back then I thought it odd that it said that the DM should destroy the physical map his players had drawn if the in game map was destroyed. I really wonder how common it ever was for gamers to actually do that. A very special kind of immersion, indeed.