I can tell you that if you write for Amazon Publishing, they will be sending out ARCs as well as posting the book on NetGalley, and they also encourage an author to use their own ARC team. Audible also encourages review copies. (Promo codes.) If you assume Amazon and Audible know what they are doing as far as customer reactions and behavior, yes, ARCs are helpful.
To address the tangential point, an author’s early reviews, if they are a popular author with a devoted fan base, are likely to be largely positive, whether they come from ARC copies or not. Those are people who waited eagerly for the book and read it right away. I have heard anecdotally that some authors remove low starring reviewers, but do not know anybody who does that. I believe that is more something that is done by the shadier sort of author. Personally, I have books with no ARCs and others with ARCs. I have never seen a difference in review average between ARC reviewers and others, unless it is a free book or a book that Amazon promoted heavily, something where a lot of people will pick it up even if it is not their normal read. Those tend to come in a little lower on average, understandably.