1)As i have already said before i didn't say that the power gap between docked and undocked is comparable to the one between PS4 and Vita, it was just an example to make the concept clear, i could have used PS3 and Vita, PS3 and PS4 and so on, it wouldn't have changed anything because that part of my post wasn't about actual power but about the limits of the docked mode.
2)Killzone Mercenary WAS based on a ps3 game, it was made with a modified version of the Killzone 3 engine, search on internet if you don't trust me. Obviously Mercenary isn't exactly like Killzone 3 but you are probably the only one to think that Killzone looks like a XBox game.
3)Using as examples bad ports of games that were made for completely different hardwares ported by third party developers that didn't have much confidence with vita is the very definition of cherrypicking exactly like posting Virtua Tennis 4 to say that Vita is as powerful as the PS3 is cherrypicking.
Comparing the best first party exclusives, that's how you do fair examples and infact Killzone 3, Killzone Mercenary, Zelda and Horizon are all among the best first party exclusives hence the best way to compare what an hardware can do.
About Lego City, Snake Pass etc they are like the Vita games multi with PS4 except that Switch is more powerful than Vita.
They are nowhere near ambitious and comparable to Borderlands 2 and NFS:MW, Lego City is a last gen enchanced port, Snake Pass is an indie game, while Borderlands 2 and NFS:MW were native AAA games on the PS360, when Switch will get ports of native PS4 AAA games(for example the new Need for Speed and the inevitable Borderlands 3) we can make comparisons.
Need for Speed Most Wanted
is a very good port, it was by Criterion Games, runs off the exact same engine and is the best you can expect from Vita in terms of how it'd handle a AAA open world driving game.
I'm sorry, but Killzone Mercenary is not a very good example to use at all. It was developed over a three year period specifically for the PS Vita, so it's been built to show off its strengths, much like how Resident Evil Revelations did on the 3DS. If you ported Killzone 3 - a game designed for PS3 hardware in mind, down to the Vita, you'd get very unfavourable results.
That you're trying to instead compare BotW to Horizon is ridiculous, the games share nothing in common from a technical perspective and one was built for the Wii U for 3-4 years before getting a Switch port in March 2016.
And dismissing Snake Pass as an "indie game" and not being "ambitious" goes against
what the experts at Digital Foundry said in their tech analysis of the game.
Anyway this is the last I'm saying on this topic about console-to-handheld ports. I still think it's ridiculous that you think it's fair to compare 1) Killzone Mercenary to Killzone 3 as a good example of PS3 games that scale to Vita and 2) BotW to Horizon as something similar to your comparison in 1) for the Switch. I've already explained why that is. I'm surprised that you don't think NFS: Most Wanted is a good example of PS3 tech scaled back to Vita, because it's quite possibly the best console-to-Vita port on the format, full stop. Just because it has a lot of compromises doesn't really make it unimpressive, because Criterion did an amazing job on hardware that's basically an iPad 3.
Picking NFS Most Wanted was not me trying to cherrypick or show Vita's capabilities in a bad light, but picking Killzone Mercenary is the very definition of misleading, because
it's not a direct port of a PS3 game but a game built from the ground up around Vita's limitations, like how Resident Evil Revelations on 3DS
was not Resi 5 even though it shares the same engine and a lot of tech/shaders with Resi 5.