Oh certainly, but it prevents it from being a universally practical control option. Something like Lawbreakers or Titanfall, this would work poorly for, because of the verticality.
It works well in splatoon because it's designed from the ground up to be a largely, horizontal playing field. Which is fine, but I think this is one reason you won't see this type of control scheme being popular within other shooters, or at least shooters of a certain type.
Verticality is not an issue for this control setup, or better put, is not inferior in relation to the thumbstick which is the main argument.
Do people actually know some of the reasons why stick movement is restricted to X axis?
Quite simple. Motioning with a two handed controller in the X axis is more restricitive, this is why the stick is there to assist the camera turning. However, motioning in the Y axis is so simple and subtle that having it in the stick would be redundant, specially when the Y motion is more exact.
Sometimes I wonder if you guys have played shooters on other platforms when saying things like this. The level of accuracy required for Splatoon's charger is far lower than something like Halo's sniper, or even Quakes Rocket launcher, and their are ample number of far more impressive montages available for each - nothing in that highlight video rivals what I have seen from the best keyboard and mouse players.
The "concensus" with the majority of people that tolerate motion controls is that it serves as a nice middle ground between mouse (the most exact) and Thumbsticks in terms of precision. It is also a middle ground between them in terms of confort and convinience, mouse and keyboard geting the shaft in this case.
I also disagree with the idea that Splatoon's motion controls are more intuitive. Players have to use both analog, motion, and a button to reset the camera. Splatoon's motion controls certainly work well, but that's at the cost of accessibility, as they require players to coordinate their movements with the right analog, as well as persistently reset the camera. Pure motion controls are incredibly accessible, yes, but Splatoon's implementation is not that.
i do understand your position and it has merit however:
1) Actually some people play Splatoon 1 motion only since there are sensitivity options.
2) Since the Switch has a transformable controller you can split the Joycon and playing the game motion only is easier in comparison to the first game since using 1 hand to aim is less restrictive. In this way the control retain it's intutiveness better.