You mean making spinoffs that don't take the place of main series games and just exist as an added bonus? My god, those ********. We should put them out of business for this.
It's not that they're making a spin-off, I just think there were much better ideas they could have gone with than a "head for the goal" 2D puzzle platformer when it comes to Pikmin. Not to mention that it looks way too similar to both Lemmings, and Kirby Mass Attack. They just seem to make way too many games like that. First it was Paper Mario becoming more like a platformer, then 3D Mario being more like a 2D Mario game (for the record, Super Mario 3D World is my favourite Mario game from a pure gameplay standpoint), then Chibi-Robo, and now it's Pikmin. What next, an F-Zero or Animal Crossing 2D platformer?
It's also yet another game that seems like it's lacking in any sort of creative drive or soul. It just looks bland as a game in general, like they are making it for a quick buck because they know some Pikmin fans will buy it out of curiosity, not to mention the fact that Olimar being slapped in there also helps drive a few people's interest since he is in Smash. That's just the general feeling a lot of Nintendo games have been giving me lately. I get that they are trying to make smaller, lower budget projects, but they could stand to be more creative. Captain Toad: Treasure Tracker was an example of a game that did it right.
I think it would have been more interesting to make a game solely focusing on the Pikmin, without the lead of some captain like Olimar. I think there is a lot they could do with that, and would make more sense than just making a Lemmings clone. Maybe some kind of game where the Pikmin are building a sort of paradise for themselves with Pikmin houses and vistas and such, but they have to protect it from all of the monsters that wander by. Sort of like a Pikmin tower defense game. I think it would make much more sense, as you could take the core aspects of the main games (resource gathering, exploration and survival), apply them in a different way (such as using resources you find to upgrade defenses), and make the Pikmin themselves the main characters, rather than the captains from the main games, therefore expanding on the Pikmin as characters in a meaningful way (sort of like the animated shorts did).
Basically, it's all well and good that they want to make a Pikmin spin-off for the handheld, but they literally took the most uninspired approach that barely takes anything from an actual Pikmin game beyond "you play as Captain Olimar and chuck Pikmin at enemies". It's like if Nintendo made a Mario spin-off game starring Rosalina (something myself and a lot of people reallyw ant), and made it a game where you have to pick a nice outfit for Rosalina to go on a blind date on and you make clothing designs for her to wear on those dates. Like yeah, people might want a spin-off featuring the character, but playing dress-up isn't exactly what people came to appreciate the character for, and has nothing to do with her. When you're making a spin-off, you're supposed to retain a good number of the core aspects of the franchise/character you are making a spin-off for, usually elaborating on them in some way, otherwise it's not gonna appeal to fans of that franchise/character. This is why Sonic Boom: Rise of Lyric failed so hard (besides the glitches). It was a Sonic game where Sonic traveled slower than Mario for most of the game. This is also why Animal Crossing: amiibo Festival failed, and Happy Home Designer succeeded. The former took nothing from Animal Crossing other than the characters and aesthetics and added an unneeded pay wall with amiibo, while the latter honed in on a specific element of the main games, and expanded upon it.
Hell, even Federation Force is actually successful in this regard (it just has one or two other problems holding it back). Shooting and action is a part of the Metroid Prime games, but those games aren't nearly as action-packed as most other shooters, so Federation Force decided to expand on those mechanics, and expand on a certain aspect of Metroid's lore (the Galactic Federation) in a meaningful way.