You aren't going to need anything from level 1-3 after you go through the portal. And nothing is stopping you from drawing a map with pen and paper, or using one that some else has made. Where is this spray paint coming form anyway? Or when you make it to a place that has dyes your going to cover your character in dye trying to carry glass jars, cannot discount this element of realism if your taking the other part of the realism. Why would the Devs put in tools for you to just put peni on everything? Because it's screen shots of the game is going to become inundated with with a mechanic like that.
A core tenet of the game is for the player to do things themselves, the player themselves. Why is drawing a simple picture homework? Why is homework bad? When did picking up a pencil/pen with some paper become so tiresome? Or and this is the hard one, you could try to hone a simple but useful skill of trying to quickly memorize something, it's handy in all sorts of things. Or take periodic screen shots if you don't want to use a pencil, or a picture. Or drag garbage around with you putting piles or markers of your own around places, though your still going to keep a key somewhere. What exactly is drawing something on the ground going to do? If you need a breadcrumb trail level trash behind
I get it the physics, interact with the world... It is what the game is about.
also this pertains
http://steamcommunity.com/app/362490/discussions/0/496881136921634265/
Bare Mettle [developer] 16 hours ago
I didn't read the whole discussion because it's long, but signs would remind me of a modern supermarket rather than this particular setting. Having signs everywhere is an extremely modern concept, in medieval times signs would at most guide you to a town on long distance journeys.
Either way I know I don't look at signs unless I'm visiting somewehre for the first time, in a place like this you'd expect anyone new to be shown around by someone who knows the place.