Because Vehicular Combat has a meaning to it.
If you want to say a Mech Form, then say Mech Form. Not that hard.
Same as if you said Ogres are playable because you have a trinket that turns you into an Ogre. Would you really consider that character to be an Ogre? It's just a form.
Staves have been in the game well before Monks were.Or like the Brewmaster’s staff which the Brewmaster had in WC3, yet didn’t appear until the Monk class entered WoW?
Where is the claw pack?
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Blizzard is the only one that decides what classes get added to the game. If anyone is denying their possibility, it would be Blizzard, not any of the fans.
Fans can't actually deny the possibility of anything. You can argue against a Blademaster, but you can't deny its possibility either. That ultimately comes down to Blizzard.
I mean, look what happened at all the people who denied the possibility of Demon Hunters. They had zero power to actually deny them from existing.