[aogaili]

There is no lock-in, developers can migrate in and out, and you choose the view layer, the backend is build on node, third party packages are from NPM and the DB is MongoDB. The data layer can be DDP or Apollo.

Of course if you use all the aspects unique to the stack (reactivity, accounts, blaze, pub/sub etc.) then you'll to re-implement those when switching, but then again that's an architecture choice, you can choose to ignore those and just use Meteor as a build tool.