Yeah, to be honest, I think that having a non-anonymous rating system would only make things worse than what we have now. Knowing the username of someone who gave your story a bad rating probably doesn't seem like much harm, but there would definitely be a ton of let's just say "strongly worded" messages from distraught authors to the raters, and that would probably lead to a drop in rating frequency overall.
After all, this is right, why would you as a reader take the time to review or even rate a work fairly when you know that anything less than a 5-star rating could net you a possible grudge, and subsequent brigading by the author? I know that it feels unfair to just get anonymous, drive-by 1-star ratings because I've had the same thing done to my story (mostly over on Royal Road), but the sad truth is that the anonymity is there to keep the readers safe, not the authors. As an author, by posting your story in the first place, you've put yourself out there to be judged, and people are entitled to their opinion of your work, no matter how baseless or vain their opinion may seem. And well, if you truly think your story deserves a better rating than it's gotten so far, maybe your story is searching in the wrong audience.
For example, Royal Road and Scribble Hub have two very different audiences from what I've seen. They definitely look for different things, and from my observations, Scribble Hub readers are more inclined towards "weeby" stuff and more light novel-esque stories, whereas Royal Road readers are more inclined towards western-style literature or serious stories with overarching plots. That's not to say that there's absolutely no overlap at all, but speaking from my experience in the Royal Road community, there is definitely a portion of the Royal Road audience (albeit a small portion) that do not like anything anime related. For example, on Royal Road, one person even told me straight up in the comments of my first chapter that they literally gave me a 0.5-star rating because they hated the anime art-style that I drew my characters in. They've since deleted that comment, but man, I can't tell you how soul-crushing it was to read that someone didn't even give my story a chance because they didn't like my artstyle, and it really took all the self-control in me to not send them one of those "strongly worded" messages and instead just accept that not everyone likes my story. I'm sure that not all of my low ratings were due to the reader not liking the anime-esque style of my story, and some people genuinely just thought my story was awful, but just imagine if I could see the names of everyone who gave me a low rating. As much as I like to spread positivity in the comments of my story, I'm not a saint, and there would be no way I would be able to resist at least pressing a few of them in private for a reason to their rating if I was given the option to. The anonymity of the rating system is, unfortunately, not a shield for the author's feelings, it's a shield for the readers' right to an opinion.