I've started to play on a Playstation Vita in 2014 and that was around the time I've taken more interest in japanese games as a whole, not just mainstream stuff. Games such as Soul Sacrifice Delta, Akiba's Trip 2, Atelier, Earth Defense Force 2 & 3 Portable, Dragon's Crown, Super Robot Wars, etc before progressively getting into imports (Amagami, Ys8, Puyo Puyo Tetris, Taiko Tatsujin V & Idolmaster, htoL#NiQ, IA/VT Colorful, Gundam Breaker 3, Dungeon Travelers, etc). Not to mention the myriad of PSP and PS1 games that I wasn't aware before. The hack exploit also made a lot of things simpler for the system later in 2018-2019, and thus no longer forcing everyone to be stuck in a single region and the damn restrictive memory cards for digital stuff.
And the Switch is definitively a successor of Sony's handhelds for japanese games while still having the usual Nintendo's stuff for the more normalfag tastes. Most of the nippon titles I've played or simply noticed on Vita are now ported there in addition to new games/sequels, a lot of them are franchises that used to belong solely to Playstation's turf by essence. That's why japanese game sales are interesting to see how much the respective audiences shifted around between the PS & Switch platform, and how all of this affects development and releases in the long run. Game projects usually take a long time to be made before announcements.