The problem is that it's impossible to guess correctly 100% of the time. You can improve the guessing algorithm as much as you want to (not that I'm saying it's useless - it's very good for regular users who only rarely encounter such issues), but you can never achieve total accuracy, which is why some sort of manual override is absolutely necessary in cases when it fails.

I agree that good detection is important and I am glad that he is working on it, but I don’t think that the level of detection which is possible is a good replacement for the menu, based on what he himself has indicated he thinks is possible to achieve in Firefox.

Extensive maybe, correct apparently not so much.