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You’ve provided no links or references to any of your rebuttal here.

Hydrogen-powered planes almost ready for takeoff

No they aren’t, and they never will be (save for maybe a few small private one-offs). Certainly never for anything commercial.

Enemies you defeat will stay gone until the next Blood Moon, which triggers after you defeat a certain percentage of enemies in the world. It’s designed to keep the game exciting and fresh so there are always enemies around.