@tmnxeq pointed it out already and we also discussed this in Proposal & Voting Rules although it revolved more around abstentions counting towards a threshold.
I firmly believe that every vote should have an option to abstain, otherwise a reason should be given why there is none. I mean, we want people to participate and be engaged in voting. If we force them to make a binary decision, there is an increased risk that they just vote, without understanding what they vote. If they can abstain though, they could always choose this route and if after a vote closes there are more abstentions than yes|no votes then it tells us, that either the proposal wasn’t clear or people didn’t care enough.