Also, why isn't Hogwarts warded somehow against Portkeys?
When Snape and McGonnagal travel to Mary's, they have to take the Floo to Gringotts first, and remark that this is the fastest way out of Hogwarts. Presumably a Portkey would be faster (since it could take them directly where they wished), so either Dumbledore doesn't have Portkeys prepped for major locations like Diagon Alley (which would be stupid), or MoR!Hogwarts is warded against leaving by portkey.
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My take on this is that it's just an illustration that wizards really don't understand science, and they'll be unsuccessful at implementing their anti-physics charm.
Who knows, free Transfiguration works but seems to conserve mass, broomsticks work, but have effects similar to the standard reactionless drive+inertial dampener (and you can make a "reactionless" drive if you can shake masses about fast enough in curved spacetime paper)