You're completely correct, but you're forgetting a critical aspect to this whole thing: Teenagers are really, really fucking annoying.
Chii is the archetype of the eternal manchild (or whatever the female equivalent is), the person who can't let go of the past, who's all talk and big dreams but makes at best a token effort following up on any of it, and generally is just someone you eventually outgrow as a person. This is coupled with her crab in a bucket mentality, where instead of supporting her closest friends and the changes in their lives, she wants to drag them into the muck of her standstill attitude with her, keep them from developing. There's also the fact that Tokio is just kind of a decent guy who doesn't deserve being ignored/strung along like this. And finally... this chapter honestly makes things worse, because it seems to recontextualize everything as Chii being completely aware of this, and that's just inexcusable.
To counter that, I think that judging a child for being a child is a bit unfair. That's maybe a bit of a personal take; but I know when I was a kid I was definitely immature as fuck, even into my college years. It can be annoying to watch from an adult perspective because you're watching something happen that seems like it could be solved if they were just more mature, but I see that as the point; she is going to learn to be more mature. That's the arc I see. In fact, we've seen similar arcs for all the characters in the main cast, usually using themes of duality:
Anjou and Seto: Feeling stuck in your identity vs Not knowing your identity
Toyoda and Inuyama: Passion without knowledge/skill vs Knowledge/skill without passion
Tokio and Chii: Wanting to grow up vs Not wanting to grow up
I feel like the formula here is generally that the boy part of the pair is the driving factor in influencing the girl part of the pair, and that worked well for the first two because we got a good amount of focus on them throughout the story. Then, we kind of cram all of this development between Tokio and Chii later on, and it does feel a little forced, a bit like they could have characterized Chii a bit earlier but they didn't (and to be fair they didn't really dip into Anjou's biggest problems until we were really deep in). But most of all, unlike Anjou or Toyoda, Chii appeared to simply be unaffected, and from this chapter we now know intentionally is trying to not be moved. Which I think in a romance story is definitely irritating. What this makes me wonder is what the turning point is going to be: Chii getting past her insecurity to tell Tokio how she feels (and hopefully not reject him or commenters are going to crash out), or Tokio working up the maturity to finally just confess to her straight out? I bet 100 zenny on Tokio, any other bets?