I agree with you that Puks and Khimaira should be in Beastmaster's domain, as they have "beast" components, I just don't agree with you on Wyrms, Dragons, and Wyverns.
Beastmaster has a ton of potential pets left untapped, including a lot of powerful great beast types. I don't see the push in getting SE who already has a rigid stance on lore and fighting to get pet issues fixed, just to give Beastmaster a wyrm pet.
- Saying BLU and BST overlap, is like saying how do I feel about WHM RDM SCH PLD RUN overlap in White Magic and BLM RDM SCH GEO DRK overlap in Black Magic. Or how I feel about Ninja getting Max HP Boost when it was a Monk trait. That list goes on forever, there are shared abilities, effects and traits. However those things have nothing to do with lore.
- Killer effects on weapons and armor are no different than any other shared thing. If you want to get technical. You can say the same thing for Double Attack, Triple Attack, Magic Attack Bonus, Magic Defense Bonus, list goes on and on.
- Kindred are Demons. Demons are predatory to dragons. So a demon Beastmaster having a dragon pet makes a lot of sense because it is unique to their species not the job.
- Bahamut counter-argument makes no sense. The only interaction we have with Bahamut is CoP-related which the story has nothing to do with Dragoons. By that logic it doesn't make sense for a Dragoon whose lore is to hunt wyrms and dragons to subjugate one. But somehow it makes perfect sense that a humanoid Beastmaster with no lore whatsoever around dragons can...
- Yes puks are part dragon, just like they are part vermin. Not sure how you're trying to correct me when I said they were a chimera (hybrid) of both.
- I don't understand the Monoceros part in regard to advocating wyrm pets for Beastmaster.
- Khimaira are part beast/reptile/whatever else, as no one completely knows and are a chimera (different spelling). The general definition of a chimera is a definition of any species comprised as a hybrid of more than one species. In FFXI, Lamiae and Puks are other chimeras.