The reason a reference mattered is the part you lose fastest. Note why you saved it — the colour, the crop, the pacing, the client it was for — and the note stays attached to the link. Six months later the board tells you what you were looking for, not just what you were looking at.
A collaborator opens one board and sees the references you chose, grouped the way you grouped them, with your notes on each. They add theirs to the same board instead of starting a parallel list somewhere. When the work moves on, the history of why it looks the way it does moves with it.
Every reference you save teaches the feed what you like. It surfaces more of the same, so the next palette, layout or technique you are after is already waiting instead of buried in a search.
Split a project into its parts without losing the whole. A board for the rebrand, a board inside it for each format, and one link to hand over the lot.
Every Glubler is public unless you close it. Follow the people whose taste you trust and their references land in your feed, ready to borrow, adapt or use as a starting point.