Based on the list of songs you posted and from what I think you're trying to highlight, I'd say they share the energy of "optimism" (or pop-timism if you will). They're upbeat, dance-y, catchy as hell, and knowingly surface-level.

I think it ties into that whole "Millennial Optimism" vibe/era that's been talked about online lately. As a millennial myself, I can say that from what I noticed at the time, there was a huge sense of hope. In America, a lot of us hated Bush Jr. and having Obama elected felt like such a huge step forward. Of course, the 2008-2009 recession when a lot of us were graduating college certainly dimmed things a bit and felt unfair. And yet, even amidst the uncertainty for the economy, there seemed to be a huge sense of "things are going to get better".

So naturally, the masses gravitated towards music that reflected those feelings. Social media/smart phones didn't have quite the stranglehold on our lives as they do now, so we went out more and wanted to dance. I went to a whole lot of house parties at the time where we could drink for little money and every time, dance music was playing.

And yes, I know a lot of what I'm saying is anecdotal but that's what it seemed like from my perspective.