Thanks for the reply, but this doesn't explain why correcting answers is so frowned-upon. Or a general hostility in tone from the mods.
No worries. I find that in practice the kinds of questions that I can't answer for myself (the kinds for which a natural language question rather than a straight Google search for documentation is helpful) are almost always already answered anyway. So having it a read-only site is not a big deal.
I think their model does indeed turn away a lot of people with good experience and intentions, and even leaves a lot of incorrect cruft lying around, but overall it's a mostly-beneficial source of information, with, as you say, high searchability.
As for the bags at least, that's absolutely not what that article says.
In fact, that article doesn't take into account the littering of plastic bags. But sure, I'll grant that if you're the type to reuse bags, you probably aren't the type to litter the plastic ones in the first place.
I agree the priorities in that situation sound misplaced, but I would not characterize that as putting technical concerns first. Fatal bugs are a technical concern.