There are far too many requests and comments on such features on itch.io for them to not be noticing and ignoring them. Like the more times I've tried to give them the benefit of the doubt I think that maybe they're trying to prevent some form of very toxic cultures to form on their platform the more it wouldn't really prevent that from happening it just seems really weird potentially having a button that says blocking or having settings that almost get you there but are too extreme for most people to use it.
Like blocking here isn't even a proper muting button, and you'll come across like you're intentionally doing something bad when you lock your comment sections, it just feels like there's something else going on that's not wanting them to push these moderation tools any further.
Also, I'm sorry to hear what you're going through, I've seen a lot of creators having to shut down feedbacks. Because of harassment.
Especially in the dating sim visual novel community... younger players that were reported and never done anything about it would just return harassing developers.