@OP What we're seeing here is all the AA developers slowly moving from 3DS to Switch. Octopath was made by the same team that did Bravely Default. SMTV is the SMTIV, and SMTIV Apocalypse team. Yokai Watch was a 3DS series. Thanks to a trailer from earlier this year we know that Etrian Odyssey series is Switchbound as well.
https://www.youtube.com/watch?v=yT7EiZR6hMI&vl=en
The five tombstones represent the 5 EO games on 3DS. The next stage is Switch.
Seeing Nintendo's library finally merged onto one system is such a wonderful thing. We're getting Fire Emblem, Animal Crossing, Poke'mon, Luigi's Mansion, Octopath, Shin Megami Tensei, Etrian Odyssey, Yokai Watch 4*, and many other great games. Hopefully Nintendo releases another top down Zelda, for Switch as well. If Nintendo went ahead with two seperate systems instead of the Switch, we'd be missing these games from the Wii U 2, or whatever you want to call it. They would all be on the 3DS-2.
*Okay I'm not exactly all that hyped for Yokai Watch 4, but Level 5 has made some awesome games in the past.
Oh and BTW I agree that exclusives define a platform.