The genre things is another of those suggestions that comes back around every few months to a year. And there's very lttie movement on it. There's been a little movements (I remember the first seperation of Romance and BL, the arguements about why BL was seperated and GL and then LGBTQ+) and, if previous genre adjustments are anything to go by, we might see Isekai seperated out into it's own genre. That was the argument Tapas gave for seperating BL from Romance, after all: there was so much of it it justified it's own category.
I've often felt like something more like a sub-genre system would be useful. For instance, one of my biggest issues is that Fantasy is such a massive genre it covers everything from LoTR to ACOTAR to isekai to urban fantasy. Even a loose sub-genre system like High or Low Fantasy or Historical or Urban. Even the broadest sub-genres. You could seperate scifi into things like retro futurism (steampunk is a bit specific, but the broader category works) space opera, aliens, alternate realities ect. Even things like Romance could be broken down into a couple of broad categories from Dark Romance/Romantic Thriller to Supernatural/Paranormal Romance or Classic Romance ect. Just a few broad sub-categories could do wonders for helping readers and writers find what they're looking for.
Reviews and ratings doesn't seem like a good idea though. There are already comments.