The spectacular timing of the launch is what made it so successful, imo.
At the Switch Launch, it's only competition besides Zelda was 1-2 Switch and snipperclips. Only like what, four games to compete with at launch? Had this launched in last November it would do 300k at most.
Actually, I forgot about Snipperclips, I may pick up Plus down the line as it does look interesting. However, if I get Super Bomberman R it'll probably be for PS4.