It was such a simple and useful thing, and for some reason GOG cut it out.

What votes? Another thing removed?:O comeon gog , stop doing this.

They took it out quite a while back. The wishlist entry seems to hardly gain any traction though...
For the games that fall within its Legacy Mode scope, MaGOG can be used for that though, and the info is still obtainable through the API (not that I know how).

That was in october 2018.

Because snowflake-friendly games would reflect badly. And their companies wouldn't like hard numbers be on display, much like their special audience don't like hard facts.

Normal people usually do the "thumbs down" vote, on such things.

Cannot mention examples, even though many titles are in my mind (with low score and heated "debates/arguments").

GOG tries to please everybody, is all. Besides, estimations and guesswork, or if you prefer statistics, aren't really that hard to perform... Some people need those to be "cooked" (or craftily "hidden").

Thanks, that works.