The adventures I’ve run by Necrotic Gnome also use a mix. If it’s only in the key, that monster’s not going anywhere except under exceptional circumstances. If it’s on the map, then the stats will be in the key for that room, but the monster might leave its room to investigate/fight/etc if the PCs do something to draw attention to themselves.I'm running L1: The Secret of Bone Hill in about 45 minutes, and it uses rosters rather than specific placements of adversaries in the titular ruin. I often design adventures with a mix- a roster at the start of a level and then rooms with, for example, "1d6+2 goblins" in them.
That’s generally the style I like, especially if the key includes an excerpt of the map with surrounding areas. Let me see visually where things are in relation to the PCs. If it’s on a chart, I’m apt to miss it.

Edit: Looking at Halls of the Blood King, I don’t think Necrotic Gnome is as consistent in using a mix as I’d like. There’s no way the monstrous doors in area 11 are coming after the PCs in another area. I still prefer the visual format for the reasons indicated above.
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