I'm well aware of that, that's why I put 'That makes it sound like', in my first sentence. Should've put something more clear at the end as well.
It sounded so harsh and hard to believe to see some characters 'do nothing' or only 'briefly appears'.
I agree that each arc usually has only a handful characters under the spotlight,. The point being, that according to what you posted,
it makes it sound like with so many new characters, the attention has shifted a bit if you notice that Yuki and Mikuru (and even Sasaki?!) don't get much appearance. That might feel a bit awkward for the fans of the 'vanilla' cast. Not me though, but it creates room for criticism.
I'm also not sure if the alpha-timeline is supposed to show us the mundane world without the Sasaki intervention and introduce us to Yasumi. I mean you might be able to conclude that, but I haven't seen enough to conclude that.
Also umm...I believe I've read somewhere on another page that is was Fujiwara who used the 'regulated item' to split the world. But now you're saying Yasumi is the one who did it?