There is one glaring omission IMHO: documentation, or to be precise its quality. It happens way too often that even the "latest" version of the documentation (

There is one glaring omission IMHO: documentation, or to be precise its quality. It happens way too often that even the "latest" version of the documentation (assuming it exists) contains code that outright does not compile, does not work or yields deprecation warnings. I get the motto is "move fast and break things", okay, but at least don't make me curse at you while trying to get started on your project. Also, when you introduce breaking changes or deprecate something, please give a healthy amount of "common patterns of X gotta be done like Y now", and a decent changelog. Don't make version upgrades even more painful than they already are, or at least try to provide shims.