The real issue is that they don't have stable intra-kernel ABI/APIs. It should entirely be the case that technologies that are 10+ years old are stable and a cl

The real issue is that they don't have stable intra-kernel ABI/APIs. It should entirely be the case that technologies that are 10+ years old are stable and a clean abstraction layer can be created. You maintain the abstraction layer and all the things on the other side of it don't have to track random kernel changes. Things like this just keep working indefinitely.