They weren't necessary, but a lot of the things on this wiki aren't necessary but are preferred. Take commenting for example. Not all wikia sites let you comment because it's not necessary, but it is preferred
Now before you ask how is it 'my opinion', this is 'how it's supposed to be done'. There is NO 'how it's supposed to be done'. Some people say it looks better in one way, others say it looks better another way. YGO's is how someone there likes it.
=.=" if that were the case then i was doing the same thing. But I KNEW we would have an endless struggle between us both on the editing department Xd, so I decided to sort it out in a civilized manner and talk it out.