I think the listed examples wrt DFINITY’s voting on 80970 and 86639 wouldn’t really benefit from this proposal, because DFINITY wanted to vote yes on them, but their vote was just misunderstood / not explained well enough (because the first casually mentions “abandoned ICP” but leaves it to a future proposal, and the second did not ask if you’re in favor of an NNS treasury, but whether you think it should be explored more, both of these things were misunderstood as saying DFINITY is in favor of an NNS treasury funded that way, which was not the intent).
Outside of that, I see the appeal of an abstain button, but on the other hand I think it’s a bit dangerous: it would then be way too easy to hit the abstain button eg if you didnt have time to fully read up on it or didn’t completely understand everything. I worry that proposals could then accidentally pass, because the majority of the voting power abstained. I’d rather see the ICP ecosystem move to a policy where you vote yes if you’re very convinced that the proposal is good, and vote no otherwise (irrespective of whether that meant you think it’s a bad idea or you just didnt understand all the details, or you think it’s too early etc).