I think that the definition might be challenging and fun, i.e., you need to hit all the shots, like high, low, left, right, etc., but the punishment factor isn't real high. Of course, recovery shots are all part of the fun.
To me, the challenge of hitting feathering a cut to a tucked pin about 45 ft deep is the same if the guarding hazard is a 5 ft deep bunker, rather than water or a 25 foot deep bunker, that will both add a stroke or more to your score.
Ditto hitting any kind of tee shot to a narrow fw is a challenge, losing your ball in deep rough isn't fun (at least too often)
And reasonably rolling greens that are challenging to read, have variety, etc., but very few contours that might make your approach putt "run away from you like a pig possessed by the devil," as Colt once said.
Of course, one or two really hard hazards function as conversation pieces, which is both difficult and fun, if not overdone.
As always, just MHO.