In my experience, the Ecto team is very open to making changes that will help integration with various databases. As an example, this thread has a conversation for adding additional relationship types to the mongodb_ecto package. We ended up talking with José who opened up the API that would allow us to create and maintain these relationships in the mongodb_ecto package instead of having to maintain them in ecto proper.

So while there are some issues I have come across with maintaining the mongodb_ecto package, I have found the Ecto team to be very helpful in finding solutions to my problems.