Within the grounded game, I am a person who would consider quite useful the use of pulleys to climb construction materials when you want to build in high places since you can not climb the vertical stairs with grass plank or bad herb and build acorn or grass stairs is very slow with scaffolding so the pulley or some elevator for manual use would be very useful to climb this class of materials or even to another player or oneself 

I second this, specifically came to the forums to make this suggestion.

Block and Tackle on top Spider silk rope, and pebble counter weights. can use it to make an elevator platform that you could then put a stock pile on or just ride up and down =)