That having been said, the specific style of politeness presented here seems tedious, noisy, slightly condescending, and potentially even obfuscating.

Are you guessing, or did you test this?

Because I used to think the same way, but I now find I get better results with just a dash of politeness. I don't think it takes very much time or is so bad for signal:noise ratio either.

"Oh, thanks so much, silly me not paying attention to the squiggly red lines, hey do you need any help on your projects that I might be able to offer?" would be weird and not productive.

Well, I think the "oh silly me" is fluffy, you could just say thanks. But offering to help in return I think is a great think. Most people won't take you up on it, but it goes over really well.

Maybe try it for a month or two and see how it goes? I'm always really grateful when someone offers me a hand, and then I'm more likely to ask them a question or for a book recommendation or whatever. Even small things, most people won't ask you for them if you don't invite them to. Which is a shame, because then we miss opportunities to connect with people.

I'm not saying politeness is good because it's good. I'm saying it's good because it makes people more effective. I reckon that's true in most non-emergency cases.