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Finding high quality for older or non-english shows might be of some difficulty but they're quite common for shows and movies released for english audiences

This is just a guess but requiring Widevine L1 might be enough deterrence for some groups to wait for highest quality BluRay releases

This isn't true in my experience, but if you'd like to share a couple examples of shows that you weren't able to find, I'd be willing to verify whether UHD rips exist

Yes they do. On public trackers even. Almost everything i download is 2160p and DV.