when something is in the kernel it gets more maintinance becouse when people change an interface they useually go through the kernel and change everything that uses that interface to match (and there's a good argument that doing so is (or should be) required by whoever wants the change)
this by itself goes a long way towards solving maintinance issues. it doesn't cover all of them (especially the fact that sometimes changes shouldn't be just propagated, sometimes they should trigger much more significant changes), but it also significantly reduces the frustration of whoever is maintaining the system so that they just work on real fixes and improvements rather then chaseing updates.
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