Isn't the whole point of Linux for developers, freedom to use it as you see fit? I've yet to hear of a philosophy that allows you to both 1) use everything as

Isn't the whole point of Linux for developers, freedom to use it as you see fit? I've yet to hear of a philosophy that allows you to both 1) use everything as you see fit, even things marked as "internal" or "private" and 2) give you the right to complain about your software getting broken because you relied on things marked as "internal" or "private". In other words, you can either restrict yourself to the published APIs and demand compatibility or you can use the guts of the system and have no expectations of stability when the guts change.