Hi there, We're in the process of hopefully finalizing the user and developer API for metadata routing, and we'd like to hear your thoughts on a few things, especially if you're somebody who develops custom/third party scikit-learn compatible estimators. You can find the survey here <https://docs.google.com/forms/d/e/1FAIpQLSd8G8xwKKJ2gJKmqcyZafi6z3mMQdDDiHff...>. It'll take just a few minutes, and it would really help us finalize the work and have it ready sooner for you to benefit from it. Regards, Adrin