Haha - I identify with tons of this stuff from a Ti to Te perspective. You're absolutely right that we do all of that!
It's funny what you say about preemptively owning up to flaws. I have a real tendancy to do that. In fact, I asked Udog for some constructive criticism, but before letting him go ahead, I listed some of the things that I thought were probably issues for me or were part of the flaws others would perceive in me. It's a difference in approach to communication. I want the other person to know what things I've considered and what I still need their input on. I probably wouldn't say anything to them about what happened if I think it's obvious that I could have approached it better and what I could have done. I think that is why they are more likely to jump in with advice. It's being misread as presenting a problem to solve.
I find myself also avoiding getting work critiqued until I have improved it as much as possible on my own. I want people to be seeing my best effort and only helping me on the parts that I really am stuck or can't see with my own eyes because I'm too close or lack information/knowledge/insight.
One of the reasons that I tell people about a situation where I acted in a particular way is to get either their support, or alternately their reaction so I can decide whether perhaps I acted without enough information or thought. Therefore, it would be natural to offer the same in return. I'm seeing that on so many things our aims and our methods are very different, depending on what functions we use. Therefore talking about how to go about something is almost kind of irrelevant, considering that we may be doing it for different reasons or aiming at different results.
With ideas, I'm much more about the best end product rather than seeing things evolve more organically (I think that's Ti). Even LL's post about her brainstorming made me feel twitchy. While I'm not as extreme as her husband's repetition that 42 is the answer (with no explanation as to why), I do find myself not liking a bunch of Ne leaping around until people have run it by their internal filter first of what may work and what may not. I'm understanding better now though that to do that, perhaps they have to talk about it, like Fe has to articulate things to wade through how they feel and sort/discard/keep whatever is important to do so with.