I don't like coralline algae either. I don't mind some on the LR, but any where else I don't like it. I have two urchins, one is a Tuxedo and the other a Pencil urchin. The Tuxedo grazes all day and night, the pencil just at night. The Tuxedo is gorgeous, it adds beauty and is functional. For the people that like the coralline, don't buys the urchins. My glass is all clean and my LR has some, the balance I have right now is nice and it suits my taste, but as we all know, ask me again in six months and it can all be different. Kids love urchins and I take the Tuxedo out and let them pet it, they are amazed as I am too.
They way I see it, it's easy to explain, all people are different and we all like what we like. It's a matter of what each person likes. To me this hobby is so different from reefer to reefer and this is no different than people liking or disliking colored sticks.
Hoped this helped the folks that don't care for coralline and to the folks that like it, well rock on!
Dan