[General] Consider SymfonyBundleDependencies
possible solution to the sub-dependency problem.
https://github.com/mmoreram/symfony-bundle-dependencies
@cmfcmf @Guite
https://blog.fervo.se/blog/2016/02/07/bundle-deps/
http://mmoreram.com/blog/2016/02/09/you-probably-need-bundle-dependencies/
The library references in the OP is now Symfony 3.2+ and php 7.1+ which puts it outside our version requirements so moving this to 2.1.0 only as a reference. perhaps we can use the OP bundle rec and a guide for creating something like this on our own either in 2.1.0 or later using this in 3.0.0
https://medium.com/@fabpot/fabien-potencier-4574622d6a7e
could be interesting if modules require native Symfony bundles, since we do not use flex to be looked at together with #3438
Closing as module dependencies will be replaced entirely by composer and Flex.