I mean, I would argue "synchronizing with an external system" is almost synonymous with "causing side-effects [on render/state change]". Maybe "synchronizing" i

I mean, I would argue "synchronizing with an external system" is almost synonymous with "causing side-effects [on render/state change]". Maybe "synchronizing" is a narrower subset of "effects", but I think that's less of a change of the intent and more of a refinement And I do think the team has been refining this conceptual territory as they go. React is a pretty unique programming paradigm at this point, there's lots of uncharted territory. Following Dan Abramov on Twitter, he works through concepts out loud, having new realizations about how the primitives they've created fit together, what their implications are, metaphors for thinking about them, in real-time. I think they've got a very clear direction at this point, but they haven't turned over every stone along the way yet.