Well good sir, I could circle logic it back the other way just as easily.  I'll just leave it as we disagree.

You can have your opinion and I will have mine. 

The main point of a sheet is to get a broad idea of what they capable of.  Asking to sit there and describe out how each and every elemental arc slash works is ridiculous when you can just put, he is able to produce arcing slashes of elements.   It gets right to the point, there is an arced slash. 

Everything else is description from the actual post.