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Microsoft really wants Local accounts gone after it erases its guide on how to create them
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
Also, ProtonDB might not always be right with their ratings. For example, Dead by Daylight is marked as "Silver" though it's been working perfectly with no tinkering. I think the ratings take time to improve?
You might misunderstand how their "ratings" work - they simply collect all reports and when people had trouble with the game before, and gave a negative or "tinkering required" rating, it will show in the overall stats.