> you don't have to document things because people "just get it".

and then a year later when you have to figure out why something was done a certain way what do you do? or when some of the people that "were there" have left and nobody else remembers?

If all the discussions are written, there is no risk of forgetting anything: even working in an office I always send an email after a meeting or random chat to the person involved to document what we talked about, what was decided and why. I might also cc other people that should be kept in the loop, which is also something you cannot do if you just talk.