OK, I am a bit confused about this, what are the benefits of using target as the holder of your "main" instead of focus ?

seems that:

/follow focus = /follow target

/cast [target=focustarget] = /cast [target=targettarget]

assigning focus to retain a mob for CC = assigning target to retain a mob for CC

Basically target and focus are identical except that target is exposed to the default UI.

so what am I missing?