I alluded to this when NOTIG was implemented.
As for the discussion about local markets, CX’s, a-fabs.
Currently, people place bids. Only the endgame rich players have this problem as many other markets are pretty liquid at the moment and the only supply shortages are minor.
People also used to place 1ncc bids as a signal of intent to buy for a market. And to know who to contact.
But furthermore, people use the UFO discord if they need to do a large deal or find a supplier for some weird item. The problem with leaving notes on the CX trading pair is unless you make it global, all notes hit all CX’s, it isn’t really in a centralized place.
I don’t think the ability to leave notes solves any problems. It just creates a system which doesn’t scale up and requires people to look in more places to find what they need.