...However, not a total loss and there are some great games worth mentioning that actually make the PSTV worth owning. All of the PSP Ys games are purchasable and playable along with the Vita exclusive "Ys: Memories in Celceta". So the PSTV is my Ys machine, ha ha...
Well... that makes me wish I got the PSTV on clearance. I've finished YsI&II, Oath in Felghana and VI, so knowing that I missed out a chance to play the remaining Ys games (excluding V, which is on the SNES and apparently a black sheep and VIII, which is not out in non-Japanese territories yet) for relatively cheap kind of bums me out. (I'm counting Oath in Felghana and Memories in Celceta as versions of Ys III and Ys IV respectively).
Also, with SEGA's Genesis titles on Steam (as KaZudra pointed out), maybe Konami could reach out to SEGA and get their Genesis games released there. At this point though, we're more likely to see the Tecnosoft library get released on digital platforms long before that ever becomes a thing... if it ever becomes a thing.