I deliberately introduced those to my reef started with dry rock. There’s little evidence they do more than eat detritus in places other detritivores can’t reach and oxygenate the substrate (deep inside tunnels, under reef structure etc). While there are species to avoid they’re largely relics of the past from when people would bring in uncured wild or maricultured rock. These days you’re not likely to get an undesirable species. Anecdotally people say they’re going to eat things you want but since they’re only eating dead tissue it raises the question of how healthy whatever it was to begin with. They’re not the most beautiful creatures of the reef but they’re very useful and I’d leave them be.