I want to say "thanks" and "hear hear !". I too am one of those people who wrote a big feedback list
at some point. I'm always happy when I see another one coming. I tend to think this is very valuable and probably easier to exploit by Larian Studios. Single-topic threads are probably good in some way as well, but I'm not sure how much is read in them apart from the original post and the recording of the number of replies (the biggest issues generally yield the bigger threads).
It's also interesting to see how the lists of issues raised in these feedback reports overlap that much.
I considered rebounding on some specific points you made, but I know that would start as "just one thing" and before I noticed half an hour would have passed. In a very good first approximation, I agree with and plusone all the points you listed. If you haven't done so already, perhaps consider also sending this to Larian through their in-launcher feedback form.
Ok, quick thing, if you go on playing a bit more : there is a small toggle below the standard actions and the weapon-set toggle, which activates or de-activates dual-wielding. When de-activated, it does what you are looking for.
(Ok, second thing : I thought the same as you about Sneak Attack. But there are cases, for a dual wielder, where you might want to save Sneak Attack for a potential use on an off-hand attack, and not have it trigger automatically on the main-hand attack. Still, the way it's currently done is bad.)