I dunno, Sony has never really been very good at software. Look at the PS4 OS — it actually repeatedly warns you not to unplug the machine without “powering down” from the software first. Imagine if your phone didn’t have a reliable filesystem layer.
Maybe I don't know because I don't have a PS4, but aren't all operating systems like this? It's an optimization, holding some writes in RAM rather than immediately going to disk. The software needs to know you're powering off so that it can flush those first.
You can probably configure some OS's to disable this (so that if it looks idle you could pull the plug), but it seems like a fine choice for a PS4 that rarely needs to be powered off.
Many people have written off Sony for software as far back as the rootkit fiasco. I love Sony hardware, but I would not trust them with software ever again.
Now, Nintendo... that phone would be cool.