You, sir, are a shameless liar.
1) devtmpfs problems include lousy semantics of directory removal. As I clearly said in this thread. The only "fundamental issue" here is that of crap not getting enough review.
2) devtmpfs problems include being extremely sloppy piece of code, both at the moment of inclusion and later, despite fixes of some of the problems [bet this shit will selectively quote up to the words "moment of inclusion" and claim that I admit it's good now]
3) sufficiently recent udev *does* make devtmpfs mandatory. As you very well know.