This post was my attempt at a 10,000 foot view summary, and given the number of <3s on it I assume people feel it's at least vaguely accurate. But it's probably more concise than what you're after. I think the rest of that thread did a decent job fleshing out some parts of it, but certainly not all, and this new thread is kinda not touching on any of it except syntax (I hadn't posted in this thread before because there's only so many times I can say "this is all academic bikeshedding; you're missing the real problems" before it starts sounding rude even to myself).
But we're definitely missing a proper summary of these issues, like I did for orphan rules issues a while back. It'd take someone more interested in named arguments than me to make one.