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Completely agree, I was more wondering about whether it justifies the 20% APR.

I'm honestly curious to be clear and don't mean any offense. I'm trying to learn more about the witnesses and the processes behind Hive these days but can't find so much information about the reasoning behind the 20% APR on HBD

You would need to ask each witness because everyone sets it independently. There were multiple discussions on and off-chain regarding this. I think the idea to set it to 20% emerged yet before Luna collapsed (as they also offered 20% APR). Since then, some witnesses keep it at 20% (because there's no sign of it's negative effects) and some already changed that to lower value.