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Yes because injecting nowFn is trivial and not a case for DI. Consider a database handle, or network socket, or http response payload. Clearly each class shouldn't be making its own version of those.

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You're right, stateful dependencies like DB handles need to be passed in manually, and that's a bit of extra legwork you need to do.

Just use a static variable to the DB instance / pool, maybe using singletons, so everyone needing it have access.

You're nitpicking for no good reason. You can create global handles to each of those items, and let them instantiate with the class or override them with a create function.

Dependency injection boils down the question of whether or not you can dynamically change a dependency at runtime.

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