Also absolutely not true. GOG games ship by default with their Galaxy Runtime SDK built against for savegame sync unless you download one of their legacy instal

Also absolutely not true. GOG games ship by default with their Galaxy Runtime SDK built against for savegame sync unless you download one of their legacy installers; any game bought on Microsoft Store adds several containerization features that usually end up requiring a fully separate build. Some of those examples are almost parodistic, specifically compared to the Epic Games Store equivalent offered. It feels there's something missing from the full story presented here.