I am not telling anyone what to do as much as any other commentator, but you reacted pure negatively. I only give advice based on my experience as we all do. Like any novel over filling is not good. A bit is okay.
It's perfectly understandable to want to defend something you like, I think we all do that from time to time, but there's definitely nothing wrong with pointing out you didn't enjoy something as much as you could have and suggesting it could be changed to appeal to more people.
Like you wrote yourself, you gave advice, you didn't demand change or found offence with something. NOTHING WRONG WITH THAT.
What the writer/author/dev makes of it is completely his or her choice of course, but we all know there are many devs who are fine with criticism, whether they ever change anything over it or not.
The problem is, if you treat every creative work as if there's nothing at all to improve, no creator
would ever improve, considering that there's a whole career centred around doing exactly that (pointing out parts where creative work could be improved or editing them, as we call it), I'm fairly certain that is an absurd approach to things.
There is a difference between having an opinion or trying to force said opinion on everybody as the only acceptable course.
In this case, I don't think I agree with you, there are many VNs that are without a doubt too verbose and lose themselves in describing trivial or unimportant things to a crazy extent, but not in this one.
The game is wordy, but it needs to be, because a) it is a heavy topic that needs to be shown and explained properly and b) this is something that is a very personal work, drawing deeply from the devs own perspective and experience as ZoeyRaven shared here.
The story is important for Zoey and so every word is.
Personally, I was mostly completely fine with the writing and when something didn't interest me quite as much, I skimmed the text for a bit, like with the meeting, I didn't feel the need to know what the speaker said in every detail.
Not like I had to do that more than once or twice.
(again, that's just me, no general statement about whether it was too long or not)