There is nothing wrong with cone AOEs.
As a SAM I liked having a cone shaped Tenka Goken because you could use it outside of the packs after baiting mob AOEs. It matched the animation better and also matched other abilities from SAM's kit better (Ougi Namikiri and Hissatsu Guren, respectively being a cone and a line shaped AOEs).

The change they make is as silly and nonsensical as removing Kaiten or turning iaijutsus into guaranteed crits. They could have buffed the range of Overpower and Tenka Goken further instead of giving different jobs yet another round of boring homogenization.