Having a proper "perfer dark" preference is something we'd like, but doing that in a non-hacky way is a ton of work.
For example, you need to make it opt-in for apps, to avoid glitches like illegible text. You need to make sure non-GTK apps, websites, etc. can access the preference. You need tooling for developers to test with both dark and light, etc. etc.
Changing the system stylesheet is a hack, not a real solution and should definitely not be be exposed in system settings by default.
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