The suggestion category was created and intended for the sake of you giving your ideas to vetex, and later he can sift through them marking the ones he likes. He is a busy dude and does not have time to sift through hundreds of suggestions that may be stupid and irrelevant. Primordials and Lost magics are those cases because he does not plan on adding any new ones anytime soon.
If you try to make the argument that you should still be able to post them so that if he does like them he can add them at a later time, this is still not a valid reason for letting you post them as you can just wait until he’s accepting more magic ideas and he’s wanting to create more.
He has a set plan of what Primordials/Lost magics need to be created and wont even accept suggestions from testers/mods so when you go on to say that they shouldn’t be banned, I find very stupid since he would have to look through a post that he would never consider adding in the first place. It just wastes his time and spams the entire suggestions category.
TDLR - Suggestions are for vetex to look through on stuff he wants to add, he has no intention of adding new primordials/lost magics until the current ones are developed.