I remember that awful change:
I wasn't kiting then due to too bad connection... but this affected me, at 54 I was not able to kill spiderling in the newbie zone using my AE song due to this change... that was quite insulting and horrible. the mobs would get hit once, then run and be immune to the ae...
I was ok with the need to fix kiting, but I was shocked by the solution... some other AE have a limited number of target and diminishing returns after, why not something similar for bards?