[hellodanylo]

Do users have incentive to document and share the connections, other than helping the community's long term goal?

Absence of such incentive appears to be the reason that open-source software is not always perfectly connectable -- few people have a significant incentive to ensure this design goal.

[milansuk]

I'll launch it in a few weeks, so right now I don't know.

I believe that in the future the most of software will be open-source and If people don't have a problem sharing blocks/widgets/assets, they will not have a problem to share information about connections.

Side note: Every program has 2 parts - instructions and data. When people share assets and connections, both are instructions, so their data stay private.