This is interesting to me, in that i dont think ive ever seen an adventure where its entirety can be disseminated in the key? Hot Springs Island and Barrowmaze both break with their hex key to detail the dungeon complexes in room by room fashion. To me that suggests some hexes in the world are so flush with stuff and moving parts they require that part of the key to be prepped by someone. The hex map would then break down into areas simple enough to be run off the cuff, and areas the GM will want to prep in advance (likely a small fraction of the total map.)The problem with keys that present information inefficiently is that they’re hard to use at the table. It shouldn’t be necessary to prep the key to run an adventure. One should be able to use it as-is, which is unfortunately not true of many pre-written adventures. Technology won’t fix that.