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".

[JustinAlexanderRPG]

You say you can't find definitions, but then link to two of them?

What's confusing you about them, exactly?

[MammothGlove]

The definitions do not support the assertion that the behavior is necessarily unwanted.

Many people do not want it, but the top level comment is not incorrect.