I don't know about elsewhere, but Amazon India has been slowly phasing out returns for replacements. It used to be fairly easy to get a return on Amazon, but now almost every product I've bought in the past year or so (and that's a lot of stuff in a variety of categories, thanks to the pandemic) has been replacement-only. If someone gets a fake product, I doubt they'll look for a "replacement", so I'm not sure switching to a return% will be good enough either.

This is, of course, in addition to other issues with removing reviews, such as lacking nuance on why something was returned, etc. I've seen some stellar reviews on Amazon that went out of their way to list the minutiae of a product and the experience of using it, and that's helped me out a lot in the past.