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As such, splitting as submodules is a nontrivial maintenance cost & shouldn't be done unless there's value to the requisite boundaries.
So don't use submodules if you're the only consumer of the embedded repo?
Well don't use submodules unless the *idea* of other possible consumers makes sense and you're willing to pay the cost of facilitating them.
Because even if you don't need them now, failure to facilitate (good bds) breaks internal cross-submodule development processes.
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