You can't ask for examples and then pre-emptively dismiss them all.
Also even if you're correct and I accept your argument you are then saying that core oriented games fundamentally sell vastly better on PlayStation and main stream games sell only slightly better on Nintendo how is that not a bad thing?
I'd also definitely question your point when we're talking about a market who almost always chose Vita SKUs over PS4 SKUs for multiplatform games.
Difference is that the PS4 pretty much reached its limit and what we can expect from the plattform while Switch is only just entering its 3rd year and has alot of time on the market left. You think mainstream titles ala DQ will perform the same way once Switch is at +15m compared to PS4 or later PS5 ?
Its always the same when using a small snapshot of time to back up statements well knowing that they wont be relevant anymore a couple weeks from now. So yeah, in your example you had to get your DQB2 Switch performance negativity out of the way early on because you/we knew how things would develop a couple of weeks after its launch. Its like Pachter saying the Switch is on track to sell 8m FY 2018 well knowing how absurd the prediction is without context.
"Brand" doesnt mean anything - the games performed MUCH better in the past because they were cheaper on portables and on system with a much bigger install base ( and for the most part exclusive). You had to buy the games on DS if you were a fan. Things would have looked different if all DS DQ titles would have been multiplattform.
The difference between a DS in its prime and whatever Sony achieved with the PS3 was MASSIVE - they were reasons why games performed that way on DS, it wasnt just brand awareness. If Switch had a 20m install base at this point, we obv. wouldnt have the same discussion.
Last point - if brand awareness for this generation was ana ctual thing it would be in Sony and Playstations favor anyway - SE/Sony did alot in the last couple years to establish the PS4 as the console to play DQ games on, while NIntendo was DoA with the WiiU and even Switch was a gamble - so much that Nintendo pretty much had to "moneyhat" every little last-gen port to get SE on board.