This aspect of Vulcans has never been consistently portrayed in any of the series or films. Generally, Vulcans are as emotionally-suppressed as the plot needs them to be. I actually like this nuanced depiction, even if it wasn't necessarily the intended result. Makes them seem like a real people, with a requisite spectrum of calm to crazy (and seemingly ubiquitous snark), rather than one-note caricatures that most Trek races seem to be.
I think Vulcan society is one of the most interesting ones Trek ever came up with.