It depends on many factors. Perhaps someone is using a thick VG
juice and don't want to thin it out for use in carto, or perhaps someone dislikes that "carto taste" and doesn't want to fiddle with CE2's or etc.
The vapor from dripping is un-matched to this day, and the same can be said for TH and vapor production. I have been a dedicated dripper for 2 years and just recently I have been calling it quits with leaking, flooding, etc. I have taken to using Vision Clearos and old trusty boges.. but from time to time I drip again to remember what I am missing.
Hassle is subjective. Some actually find it more of a hassle to constantly fill cartos, fiddle with tank mods or etc, honestly I think the simplest vape out here is the Reo since I was given one by a good friend.
All the taste, none of the mess and durability to write home about, win-win if you ask me.