Seems like the visually successful "chunked" bunkers have a lot less defined edge. A clean edge and lots of angles looks too busy, to my eye.
As to the big question, I agree. A few guys did it and it became fashionable to the point of boring, much like waterfalls and almost any other course design trend. The entire shaggy edge bunker fad has, IMHO, favored visual design too much over other aspects. And, unless done really, really well, it can be a visual fail. Not to mention, not all golfers ever really liked it in the first place, it appeals to a select few (like perhaps, nearly any bunker style or design element.)
If form follows function, and any designed golf feature should consider (in approximate order) play value, visual effect, maintainability, I believe the jagged edge bunker fails in two, and possibly 3 categories.
For play, whoever misses closest to green could be absolutely screwed with an unplayable lie. While they do occur, creating one purposely seems somehow wrong. Slows play, raises scores, etc. Correct me if I am wrong, but didn't LACC remove the shaggy grass, if not shaggy edge of their bunkers sometime after re-opening for this reason?
For visuals, as discussed. It's an artificial bunker, and thus the edging is an artificial edge. Too busy, maybe. Artistic?
Maybe, but then so are simpler cape and bay bunkers.
For maintenance, as discussed, but clearly a headache to keep that edge long term.