A feature suggestion: a way to list specific possible outcomes, and have pros/cons/questions/votes relate to them.
In the "We will open a new office in Amsterdam" example, it's expressed as just a yes/no situation, but peter@acme.corp is seen asking a question which is really an alternate potential outcome. It seems like a whole separate "decision" would need to be made for that, with its own pros/cons/questions, which would be very clunky compared to having that alternative discussed in the same place.
A different instance of something similar came up for me recently. I lead a small team and a member of the team is temporarily in a far flung timezone. We normally have a team meeting at a specific time which is very inconvenient in this far timezone, but moving to any convenient time would inconvenience the rest of the team. I considered a few options and ran a small poll, proposed a new meeting time for some of the meetings, and everyone on the team hated the idea, so we fell back to having it at its normal time.
I think a tool like this could have been very helpful for listing out 3-4 possible options and allowing people to express specific pros/cons for each of those. We might have ended up at a more optimal situation, but instead we ended up with the one that was simplest to express, discuss, and agree on.
All that said: even with that feature, I am not sure I would pay for this tool. I feel like the friction of introducing "a tool" for things like this, with accounts and signups and seats and process and payments -- it just isn't worth it for the pain it would solve for me. I feel the pain, but I'm not convinced I should pay someone to fix it, or that doing so would really make things better. I also feel (as a shitty developer customer would) that I could build this or something that gets me 60% of the way there for free, or accomplish it via existing mechanisms in slack/the team wiki, where my team already lives.
(but, don't listen to me -- prove me wrong!)