Yes, when it comes to “collecting” the names can be important if you want to trade in the growth to expand your collection.I had a similar opinion a decade ago. Then I started collecting zoanthids.
When you go on a website of an online vendor, how do you find that coral from a day ago again?
How do you look for it on the internet to check if you got a good deal?
How do you check for a similar one if that WYSIWYG one is out of stock?
We need unique names for corals to identify them. And because no scientists did the market/community did the naming themselves.
My point was more about the difficulties of getting a proper (scientific) name and the challenges there. I don’t think that I have ever come across “Scientific names- genus and species for the zooanthids that are popular among reefers but there must be hundreds of “Hobby” names that work fine for the purposes that you mentioned.
I can’t keep track of many/ most of them but I agree that having a specific name for hobby purposes is useful especially for the collectors. I see a lot of “ID this coral Please” posts of people who want to know what they have or what name they are looking for to get a coral that they want for their collection.
Ideally hobby names and scientific names would be the same but that is never going to happen as far as I can tell. You are correct though, names are important.