We didn’t even see any game devs say with absolution that they couldn’t get those engines to run on Vita. After the handheld flopped in its first year many developers didn’t even putting their AAA games on it.
Yes FFA is scaled down on Vita, but it’s not as drastic as the mobile version of Fortnite to console counterparts
Many Vita games come closer to PS3 versions than that, as is detailed by Digital Foundry.
Gravity Rush is too powerful of a game to run on PS2. That Wikipedia article itself outright states its above what PS2 could handle.
Vita is capable of giving the kind of game experiences you’d find on a 7th gen console in portable form. This article doesn’t exist for no reason.
Again like I said it won’t have the same exact performance, but it’s still a general approximation of what to expect. I could give you a list of games that show the true potential of Vita like Gravity Rush, Virtua Tennis 4, Uncharted: Golden Abyss, Oddworld: Stranger’s Wrath HD, Soul Sacrifice, LittleBigPlanet Vita, PSASBR, Metal Gear Solid HD Collection to show you how Vita can perform when pushed to its limits.
Before I’d argue that you couldn’t put Doom on the Switch, yet somehow they were able to do it. I have no doubt that games like RDR2 and FFXV could never come to NS, but I’ve been surprised by what games they have ported to it. Not to mention the games specifically built for it.
There are also many ports of games on GBC, GBA, DS, PSP, & 3DS that don’t technologically perform as well as the systems they try to emulate, but that doesn’t stop them from having the moniker of being portable NES, SNES, PS2 & GameCube. It’s because just like with Vita, they provide similar experiences to the systems they’re emulating. And the original games for those handhelds really take advantage of their hardware.