Too much going on for could be too many bunkers, a lack of a few straightforward holes or greens, too many grass cut levels in close proximity, combo of hazards such as trees and heather or trees and sand or water and sand or any of the above with a dramatic feature, blind shot with decent possibility of lost ball/ball in hazard, rough in combo with any of the above etc. etc. Loads of too much going on is solved with less sand, water, rough and trees.
Ciao