I enjoy love not being an exception to Vulcan non-emotion because Humans see it as so vital and wholly good. Love is, I guess you could say, seen as THE emotion for Humanity. To love is seen as what it means to be Human.
There is something interesting about Love when compared to all other emotions...it is seen as the most crucial. A person can theoretically live without feeling joy, sorrow, anger, jealousy etc but if they cannot love they are seen as inhuman. In this way 'love' becomes a shortcut to 'Humanity'. EX: If a robot can love someone, they can be Human.
I understand why Vulcans not loving others is not really explored. It's surprisingly difficult to write but I like that, it really makes them feel like aliens. Tuvok caring deeply for his family, thinking of them all the time and being there for them and missing them, but NOT loving them - is interesting. Vulcans strive not to feel emotions and thus strive not to love others. To a Human, this sounds frightening and evil, antithetical to what we conceptualize as a "good" person/society. Yet Vulcan society as we know it is rooted in its opposition to things like war and conflict and harm. They managed to build a better world just like Earth did but without love. It's interesting!
