But really? I live in Europe and I'm still not able to order a Google Voice number... and god damn, I tried. I move between countries very regularly, having a single international number would be fantastic.

I've essentially stopped using hangouts anyway. Everybody I talked to on there is on Discord now (https://discordapp.com/). Screenshare and video calls coming soon to it too, at which point I'll permanently log off Hangouts. If I'm going to use a proprietary system, it might as well not suck.