D3 was around for years before Observable, there’s plenty of books and tutorials around that don’t use Observable, it’s an open source library that doesn’t need

D3 was around for years before Observable, there’s plenty of books and tutorials around that don’t use Observable, it’s an open source library that doesn’t need Observable, and there must be plenty of people like me using D3 in production code today that didn’t learn it using Observable. It simply is not “tightly coupled”. It is very straightforward to get started without using Observable. Observable does exist, it is related to D3. It is “loosely coupled” in metaphorical terms because there are no dependencies in the code. It seems like a useful tool. Is the nature of your complaint that the team provided a learning environment alongside D3? That they recommend their learning & collaboration platform as well as their vis library? These strike me as good things to do. I’ve certainly thought of other people’s Observables as valuable resources.