It can be a dumping ground of sorts for your ideas and research projects. I don't think so. I mean, yes, there's some pretty obscure things in there. But to

It can be a dumping ground of sorts for your ideas and research projects. I don't think so. I mean, yes, there's some pretty obscure things in there. But to be part of the mainline kernel means that you're code must pass all sorts of gatekeepers. The code has to meet a number of quality and appropriateness checks. A good number of eyeballs have to sign off, or at least no object.