Although that would suggest that Vulcans should've lost pon farr simply from developing civilization, food surplus, and climate control, or at least that Vulcans raised on other worlds like Earth would develop without it.
I think that's a pretty good indication that the pon farr is pretty deeply encoded in Vulcan genetics, if it's not a result of of their cultural practices. And I don't see why it couldn't be - humans can affect their brain chemistry and thus behaviour simply by the diet they choose (or adopt out of neglect or ignorance). I don't see why the Vulcan's lifestyle choices couldn't have a similar, more infrequent knock-on effect on their biology.
Fictitiously yours, Trent Roman