It's expected to only have benefits for longer queries. The problem is primarily that the current logic what is likely to be a long query isn't perfect, so can

It's expected to only have benefits for longer queries. The problem is primarily that the current logic what is likely to be a long query isn't perfect, so can trigger in the wrong moments. Since integrating the feature we'd added an item in the "pre-release item list" [1], to decide whether to enable/disable - but we definitely wanted it enabled during most of the beta test period. This wasn't really a last-minute "whaaaaaaa" thing... [1] https://wiki.postgresql.org/wiki/PostgreSQL_11_Open_Items https://wiki.postgresql.org/wiki/PostgreSQL_11_Open_Items