On "stopping for a while to think", I suppose it's subjective. From my point of view we spend insane amounts of time thinking about the right design for all these things. At the same time we receive approximately 50 pull requests a week, and a lot of them are for small incremental improvements which are very reasonable and could be merged very easily with little effort. So, there is a balance between "feature all the things!" and "sorry we're not merging anything for 3 months while we rethink everything from scratch". Every large scale open-source project deals with that tension. We definitely have room for improvement. But we care very much about good, minimal design, and not breaking APIs.