You need some way to get life back - and that's it. The reason why you have life regen on those pieces is exactly because you don't have any room for life regen skills. So the lack of skills explains the presence of the stats on gear.
Michael said yesterday that he even sees "life on kill" on at least one weapon as mandatory for sustain. Especially for U6 it probably works well, as you can also see in his videos.
You need some way to get life back - and that's it. The reason why you have life regen on those pieces is exactly because you don't have any room for life regen skills. So the lack of skills explains the presence of the stats on gear.
Michael said yesterday that he even sees "life on kill" on at least one weapon as mandatory for sustain. Especially for U6 it probably works well, as you can also see in his videos.