It's such a bizarre situation because non-American and American Chelsea fans have been feuding online about this guy for pretty much the entire time he's been here. I remember how Pulisic's American fans would accuse Lampard of favouring Mount over him because he's English, and then accusing Tuchel of favouring Werner/Havertz because they're German. Every single time he hasn't been in the line-up for the past 3 years, I've logged onto twitter to see these groups feuding over this guy who really hasn't done anything justify this level of stress and aggro. It isn't just online either. Local fans I meet at the Chelsea games have taken a dislike to him too. I understand he's USMNT's captain and best player, and I think most people understood signing Pulisic would come with this sort of intense following and scrutiny from US media and fans, but what it's unfortunately done is it has pushed a lot of the non-American Chelsea fans to hyper focus on Pulisic's flaws and blow his bad games way out of proportion.
It is to this backdrop, that he decides to release a book, and the only exerpts we've seen so far are him complaining about Tuchel's decisions in a season where we won the fecking Champions League, and as you say, he couldn't have known Tuchel was going to be sacked when he was writing this and the release date was set, so he was absolutely planning to have these hit the media airwaves while Tuchel was his coach and boy, I can't imagine the shenanigans it would have led to, if it happened in the way he had intended.
So yeah, I kinda like Pulisic. He's a talented guy who has unfortunately achieved very little consistency at Chelsea outside of project restart due to a combination of his own inability to stay fit, probably unlucky with some manager decisions, but really the biggest reason is that he really isn't that good, certainly not any better than the players he's competing against.