Okay, you present a very good argument. I will have to regress. I am much more tolerant of hitchhikers than your average saltwater aquarist. I am a fan of Anthony Calfo and have all his books. So, in order to address this issue I looked up what he had to say about Limpets in his book "Reef Invertebrates".
"Numerous species occur in the marine aquarium by way of collection and incidental acquisition with hard substrates. They are voracious algae grazers that are not always useful for the mixed invertebrate aquarium. Although most are herbivorous, some are predatory like the coral-grazing Caribbean Orange Limpet, (Lucapina) and the fleshy mantled Black Limpet (Scutus). Even among the algae grazing species, they can be devastating to desirable algae forms like corallines, as well as nuisance forms. Some also reproduce prolifically in the aquarium for better or for worse. While we would not dissuade you from keeping an active algae-grazing limpet, we do suggest that you restrict them to mature systems with reliable growth of algae to sustain them. There is some concern with limpets denuding young or weak batches of live rock of vital coralline, which could invite undesirable algae species to settle instead. Legend has it that their very dense radula and strong rasping action can abrade the interior surface of acrylic aquariums too. As some consolation, many limpet species will stay in one spot (like one rock) for most of their lives if sufficient algae can be grown there."
Although I don't have a Lucapina, I do have lots of limpets which never have caused damage to anything desirable. I would compare the Orange Limpet to my Chitons though. Computer crashed before I finished post. See how this Chiton keeps its favorite rock clean.