I think some people are confused here.
OP is talking about the targetting option in settings called cone.
Some people in the replies seem to be talking about cone aoes.
Apples and oranges.

And I totally agree, OP, I thought having a new targetting option would finally fix tab-targetting clunkiness but it really didn't. And this keeps being especially a problem in Frontlines, where enemies are a lot and all over the place, and move too much to be easily selectable individually.