The point of reviews isn’t for feedback to the developers, it’s to let potential buyers know whether a product is worth the money or not. I think giving people the option to leave a rating without having to write something is smart, fab has way more people leaving ratings than the old system did so it does seem some users like the anonymity of star ratings and ultimately user reviews are a feature intended for users not sellers, even though it can affect sellers performance.
You can set up a form on your documentation or even inside the product to leave feedback from users if that’s something you are open to.