What works well as an NPC cameo (or even, entire race of NPCs) doesn't necessarily work on the PC side of the fence. Similarly to the way that the existence of a troll PC affects the nature of the game much, much more than a troll NPC, because the regeneration features in the game all the time, rather than just for a few rounds in one encounter, choices of PC class and race affect the tone and feel of the game with a rakshasa PC much more than the odd encounter with a genie or rakshasa will.And before someone says "Indo-chinese crap isn't fantasy", turn to Rakshasa and Naga in the MM. Indian monster. The Gold Dragon has a fu manchu, based on the Chinese dragons which are good. The werefox from the 2e MM was practically the Kitsune. I'd dare say that Elementals are almost a Shinto-based phenomena.
The game with a PC troll in it will change in tone to that of a game with a monster as one of the heroes. If you want your monsters to seem monstrous, they probably will seem less so with a PC troll in the party - it's a juxtaposition, relative contrast thing. And you've invited into the campaign all the stuff about issues with entering a town or a tavern, people being worried the troll will eat them etc. Not necessarily bad or undesirable, but something to think about. Probably best kept out of the PHB to stop it becoming overplayed, because what's in the PHB kind of rules the nature of the game.
That said, I've got no problem with monks, but can understand the viewpoint of those who do. Push come to shove, they probably do belong in a supplement dedicated to them, rather than the PHB.
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