Yeah, I figured that out and have been playing exactly the same way. My biggest gripe with controller (other than cursor control) is targeting is really iffy with large or constantly moving mobs (i.e. one boss + traps + adds), especially since the target lock/switch commands seem to be entirely non-functional.
Hitbox is a thing here. Every weapon type not only has a different spread, but a varied distance as well. It's been noted, for example, that spears are OP as shit for hitting from range, but you need to be within like 15 degrees of the target to hit. 2HS, on the other hand, have something like 120 degrees of spread.
Target lock is pretty much just a thing for archers, maybe wizards. Both lock and switch work fine with my controller, but this is not a tab target game, I find them irrelevant. The biggest thing is position lock, which isn't on the controller map by default. Since aim direction is such a big thing, the ability to stand still and turn is also a big deal. I would recommend you do a custom keymap to make this function very easy to use.