Zardnaar
Legend
Honestly, I know virtually nothing about Ravnika, nor do I care. AFAIC, it's a red herring and a total non sequitur. Whether some element fits or does not fit in one setting has zero bearing as to whether that exact same element does or does not fit in another setting. The only reason it keeps being brought up is to confuse and cloud the issue. It simply does not matter one whit.
Would it have broken Ravnica to add dragonborn? I dunno. Who cares? Is there some tie to Greyhawk from Ravnika that I'm unaware of? Some point of comparison?
Is Ravnika the second most popular D&D setting out there? Is it one of the most requested settings in the history of the game? Is it the baseline for an entire edition? No? Then why do you keep bringing it up? Who cares?
Nope Ravnicas an example of not all phb races belonging.
It even says this in the PHB. Not all races belong everywhere.
I don't mind new races where it makes sense or for settings built from the ground up.