> Why? If it is well-designed, useful, and has no obvious technical flaws, why shouldn't it be included in open source software.

Ooh! Ooh! I know this one!

Very often, folks want to modify a shared system, to optimize for their own application.

However, the modifications could do things that would negatively impact other users of the system, or make it difficult to customize for specific implementations.

They can also add maintenance overhead, which can impact quality and release cadence.