What are you talking about?

Sony's Japan studio's own library was always gimmicky games that were basically tech demos- Ape Escape was for the Dual Analog controller, LocoRoco for the PSP, Gravity Rush for the Vita, Knack to be a pack-in for the PS4, and games for VR, Move Eye toy, etc. In fact it's kind of hard to find games they did on their own because they've always been mostly a support studio even going back to the PS1's launch lineup, and they are continuing that. There have been several studios that make original games that started as part of Sony Japan that have been spun off into separate teams too.

I'm struggling to think of many studios Sony has closed. Sony London studios was similar to Japan- mostly just games to go with hardware gimmicks like the EyeToy, SingStar, and Wonderbook. It's even harder to find studios that Sony has purchased and then closed or turned into a support studio- I guess you could count that Psygnosis was purchased and merged into London studios back in the 90's, but considering they went 20 years between that merger and closing I doubt there were many Psygnosis devs left there.

A quick search pulls up PixelOpus, a tiny studio Sony formed from 9 college grads with a couple of industry veterans to lead them They released 2 small games and were closed last year.

I don't mean to be too defensive of Sony- they did close one of their own studios and laid off ~900 people this year. But it's not really a comparison to Microsoft who now has a long history of buying 3rd party studios, mismanaging them, and closing them.

I'm also confused about your comment about Xbox making more single player games than Sony. First of all... I would expect that to generally be true. It looks like Sony owns 21 studios while Microsoft had 40 as of the Activision-Blizzard acquisition. And while a lot hasn't been announcedwith release dates, we know of a handful of single player games Sony has in the works- Horizon 3, TLOU3, Ghosts of Tsushima 2, and new IP's from Bend, Housemarq, and BluePoint. Plus Wolverine, and you could argue whether Physint should count or not since that's a partnership between Kojima and Sony-owned Columbia Pictures. If you're trying to imply that Sony is abandoning single-player games or something that's pretty far from the truth.