1. I am invisible because I don't want to announce my status to the world. If they want to find out, they'll just have to call me. Just like in a PHONE. I still want everyone to be able to try reaching me, by voice or video chat, WITHOUT ANNOUNCING if I am actually available. Gtalk can't do that.
I don't get it. If you want to use a social service, like hangouts, why don't you want people to know you are available to use the service? This makes no sense to me.
2. All the droid fans here suggest are workarounds that involve setting stuff up. I do not want to worry about setting stuff up. Sorry to use a cliche but Facetime just works the way I expect a video calling app should work. Piggybacking video conferencing on an IM service is something I will never stand for.
Those workarounds are being suggested because you have one of the most niche desires ever. You want to use the service, but you don't want people to know that you are ONLINE to use the service - and while it's possible for that to happen, you also are under the assumption that those same people will not know how to hover and figure it out. You're creating a scenario where you don't -want- to make it work.
Not when the expectations of the calling party are different for both, brought on by years of conditioning. When you don't respond to an IM, other party knows you're online and just not responding, because that's how they've been using it for the past 15 years.
So with iMessage telling you if someone saw your message on default.... its a bad service?
edit: Aha! It's not on by default. You win this round, iMessage.