If we ignore the idea of the Romulans being xenophobic, we could argue that any natural mutation that took place was welcomed as a patriotic thing, a monument to the establishing of a new home - and rendered harmless or positive through the application of modern medicine, which probably would have been available to these starfarers.
But I find it a bit unwise to speculate that the ridges are a Romulan thing when we do have ridges on the Mintakans, too. It's the ridgeless pointy-ears that are the anomaly here.
Funnily enough, I don't think we have onscreen evidence of the Romulans originating on Vulcan - it might be vice versa, really, with Vulcan just a failed colony of the Romulans, abandoned when half the colonists went mad with a "logic" obsession.
Timo Saloniemi
But I find it a bit unwise to speculate that the ridges are a Romulan thing when we do have ridges on the Mintakans, too. It's the ridgeless pointy-ears that are the anomaly here.
Funnily enough, I don't think we have onscreen evidence of the Romulans originating on Vulcan - it might be vice versa, really, with Vulcan just a failed colony of the Romulans, abandoned when half the colonists went mad with a "logic" obsession.
Timo Saloniemi