I find it interesting that the Romulans don't share any of these abilities, which makes me think that while they are related to Vulcans there are significant differences in their brains. What accounts for these differences? I haven't a clue, but it could be a factor in why they rejected Surak and abandoned Vulcan altogether.
It might be a "use it or lose it" thing. It isn't just Surak's teachings they rejected; it seems to me that they were rejecting Vulcan culture in general, so they may have decided on a "no mind melds" policy just to set themselves apart. The telepathic abilities themselves may have beem a point of contention; paranoia seems to be a common Romulan trait, especially when it comes to military types and politicians, so they could have purposefully turned their backs on these abilities as a stand against breach of privacy.