This, I wholeheartedly agree with. Two years ago core devs were saying mining had almost nothing to do with the core implementation which was a very shortsighted view. The lack of emphasis on the delicate interplay between mining and the reference implementation of the bitcoin network protocol and the block chain was a major setback. Of course one could ask why I didn't get involved then since I was busy hacking on mining code and the answer is a simple one: I don't have any faith in my c++ coding skills so it would have been presumptuous of me to try and hack on bitcoin core.