You have it on backwards. Canon is the current list of things I can choose whether or not to use at my table as I see fit, just like it is for everyone else. What happens at my table has no effect on anyone else's. I don't really care about rationalizing canon from edition to edition either, as I change too much stuff for that to matter to me. I know it matters to other people, and there are many reasons why that might be the case, but it doesn't matter to me personally.What people do at their tables is totally seperate from Canon, only official products matter for what is canon and what has to remain consistent with Canon.
I really don't care much about rationalizing canon over several previous editions and many novels spread over those editions. It's a mess, it has been a mess, and it will continue to be a mess. There are too many authors serving too many masters there to ever make it all fit. Why bother? Use what you like and leave the rest. You can clean it up to a point, and that's a fine goal, but it's never going to be pristine.
I'm not trying to trivialize your obvious passion for the subject here, but your priorities aren't everyone's priorities. Where I think we end up arguing is that I also happen to think that your priorities vis a vis 'canon' are not the priorities of WotC either, nor do I believe they should be. Not because I think you're a bad guy, or shouldn't get what you want, but because I think what you want isn't what enough people want to make it a major focus of the design process. We'll probably have to agree to disagree about that I suspect.