my second claim about WW software sales or the first one? the first is based on NPD numbers and is factual so it's not up for debate that wii u sold a fuckton more software in NA compared to vita.
as for WW, while the platform was semi-successful in japan, it's disingenuous to argue that just because we don't have the numbers we can't know for sure. while NA isn't the same as all other regions, the fact that there's such a big disparity is the SW sales of wii u and vita can be used to safely assume that similar disparities also exist in most other regions. wii u had several titles that sold extremely well for a failed platform, whereas we don't even know if vita had more than 2 or 3 million sellers ww. even in japan, vita's biggest market, wiiu had 4 million sellers compared to vita's 1.
vita had a very dedicated base that kept buying lots of games for it, but that base is likely very small to the point that it doesn't matter if each of them bought 50 or 60 games for their system, the numbers still won't add up to anything meaningful. the platform lacked any mainstream presence.
Your first claim was about worldwide sales, not US figures (not NA, NPD tracks Canada separately), so I'm not sure what you're going on about here. The Wii U and Vita didn't sell around the same numbers in the US and calling the system a "bigger failure as a platform" based on its performance in one region would be pretty silly (though I have to say, arguing "your system is a bigger failure than mine" is hilarious).
The difference is pretty dramatic in the US but acting like that's the norm when the Wii U significantly outsold the Vita in the US (I think someone said 3:1? I'm not sure) but was outsold by the Vita worldwide (assuming the EEDAR are correct and I don't see any reason to doubt them), doesn't make any sense. Different markets obviously reacted to those two systems very differently, so you can't just assume they're the same.
If the number of games people were buying on Vita didn't add up to anything or matter then I don't think Sony or devs would've talked them up or it would've received as much support as it did. Come on, you're being that guy who shits on news that indie games sell well on Switch.
And just because a system doesn't have a lot of million sellers, doesn't mean software doesn't sell on it. You're touting the number of Wii U million sellers in Japan but according to Chris1964's yearly charts, the Vita still ended up selling significantly more software overall every year. Why? Because it received a lot more games that may not have sold huge numbers but all added up in the end. I'd link the charts but I don't want to link to the old site, so if you're going to go look, make sure your ad block is on (or maybe just check google's cache of those threads).
No, they abandoned it. Look at the quantity and type of titles they released. 13 original retail titles in 2012, 6 in 2013. In 2014 they released one original retail title (freedom wars) Let that sink in. The system turned two years old in 2014, and Sony could only muster one game for it. As soon as they saw the initial sales figures come in they stopped green lighting new titles for it. Sony Bend for example, proposed several vita projects hoping to make use of the engine they developed for Uncharted Golden Abyss, but Sony rejected every proposal they made until they finally started proposing PS4 games. When Days Gone debuts next year, that will be 7 years since Golden Abyss which I think is the last game they made.
Why are you focusing only on retail titles? That makes no sense, it's not the only way to support a system. I bought Oreshika and Helldivers in 2015 and they're both first party games.
And yeah, I know they stopped greenlighting games once it flopped and I found that really frustrating at first but in hindsight, I think that's understandable given how poorly it was selling and that they did enough to make up for that with the support they gave to ports, niche Japanese games and indie games. Hell, it still had a small presence at PSX last year and games are still coming out for it. So while sure, they absolutely could've done better, they also could've done a lot worse.