In my current job, I have written a small framework. It's very limited in scope and hasn't changed much since the initial implementation, so it works fairly well. But, there is a big issue with getting other team members to understand how to use it. That alone is enough that we're replacing it soon.

Another team member has developed frameworks for both infrastructure management and creating services exposed over http. Here there is a large value in using the same internal tooling over 20+ projects. But once again, being an internal-only tool means that the documentation is severely lacking, and often we need new features in the frameworks. All of that is essentially blocking on the single team member. In this case we're keeping the frameworks, but it definitely has its caveats.