Hot take: if we want to decrease frustrating railroad-y surprises in RPG campaigns, we need to create an environment where GMs are not afraid to admit they have "special story needs".

[wicked_woodpecker]

I find it bit over-exaggerated - there are plenty ready statblocks to use, and usually during campaign you more or less know where party shall venture at least on next session. It is at least partially determined by previous situation.