lolAll this is talking about THE PAST. Things CHANGE. Organisations go international. Foreigners can be knighted for diplomatic reasons. What things do not do is stay the same. Irrespective of this subclass, Cormyr is going to have changed because it is being updated in the new setting book (and many years have passed).
fyi: writing in all caps doesn’t strengthen an argument.
And this is playtest content. Not official content. The Purple Dragons aren’t riding amethyst dragons. Hopefully they never will.
Let’s skip over your erroneous mischaracterization of current events in Cormyr, current Cormyrean law and customs, and the current military organization of the Purple Dragons for a moment so I can ask a question: who said things can’t change in the Realms?
I certainly didn’t.
(I’ve noticed lately that the fallback position for people who support this version of the PDK is to strawman anyone who points out how ridiculous it is, by claiming the lore readers “don’t want change” or want things to “stay the same” (in so many words).)
There are much better ways to achieve what WotC is aiming for than to flip Cormyr on its head.
If they’re insistent on achieving this goal (dragon riding subclass) through Cormyr, then it’s time for them to reach back into the Forest Kingdom’s deep history to figure out how this is all going to work.
(And it would be relatively easy. Thauglor the Black Doom had more than one lair, after all. It’s not beyond reason to think THE Purple Dragon of old kept other rare dragons as treasure or to experiment on.)
Otherwise WotC aren’t writing for the Realms, they’re writing a generic sourcebook and slapping the Realms logo on it.