Map design

I partially agree, but when you work on something collectively, many things have to be redone later :) Each person contributes something of their own, and this contribution doesn't fit into your initial idea. I once worked on developing an online RPG game in this way – we gathered a team of 10 people and started writing a dungeon from scratch. As a result, the work went faster, but the final result took significantly longer compared to if you were working alone (because you have to redo things :)). So, there are both advantages and disadvantages.