GOG has always been the best choice because their client enabled a simple function that no one else had and does not have. This is the sorting of games according to the date of purchase. I also liked shopping here because they are from Poland. Me from Bohemia. And have they done it yet? Is the function already there?

June 2022, still waiting.

It's possible to bookmark browser-version of library. But there is a problem: how to get there first time. I know only one way. Sometimes gog gives away goodies for some game and its store page usually have a link to this web-library.
Also gog saves bookmarks locally (reinstalling galaxy wipes them). So maybe it's possible to edit some file and add your own bookmark without waiting for next giveaway.