It's true that you lose some time by doing this. But my experience has been that it inevitably improves the quality of your code if you and your team are forced

It's true that you lose some time by doing this. But my experience has been that it inevitably improves the quality of your code if you and your team are forced to think about interfaces and common pain points by moving towards reuse. Your team members are code consumers too. Plus, you end up in a position where you can give back to the community, which is nice.