Maybe you could have made that post first, rather than "you're wrong, we need AC exactly the way it is".
Look at it like this: in 2006, who thought that having phone that needed to be charged every night and was crazy expensive and ridiculously fragile was a good idea? Sure, there were some people who had a Palm or a Windows Mobile phone, but they weren't very good. Just like people have hand warmers and electric blankets, which are bulky, inconvenient, and not very good. The the iPhone came along and was slightly better, but better enough that people would take it seriously. Maybe something like the Nest fits that analogy. Then suddenly with a few small tweaks and a change of public mindset, everyone is carrying a 12-hour-battery-life, $700, all-glass smartphone in their pocket, to the point where PCs are being phased out and hardly anyone has a house phone anymore.
So what you're saying is, we need mainframes and house phones, but maybe we should have cordless phones and network those mainframes together, because the problem of making a smartphone is just too hard.
So no, I don't think you understand. You know what's not convenient? Walking out the door and having my face frozen off by -30F weather. Having an AC unit in the living room where the cold air never reaches my bedroom at night. Bundling up in the winter. Sticking to the leather in the summer. You want to talk about convenience? That doesn't sound very convenient at all. That just sounds lazy, because it's what we have now. Lazy is not the same as convenient.
Do you have a cell phone, or are batteries too inconvenient? With current HVAC systems, you only have them in your house, your office, or your car. I used to have a bag phone in my car that I could plug into the cigarette lighter. But now I can take my phone anywhere. Why can't I take my HVAC anywhere?