I’m betting releases and iteration cycles they’re tied to. The most agile place I ever worked shipped code most days of the week in some fashion. For control reasons we released Tuesday-Thursday not Mondays or Fridays. So was nearly every day something went out.

I’m including bug fixes here but nothing got stalled. We had a working iteration loop of Test -> Develop -> Test -> Review -> QA -> Release

Lots of automated checks, investment in infrastructure and good architecture made this possible. Ironically one of the smallest companies I ever worked for