Phil,
To a degree it's compatible.
I think length/excessive length is what puts it over the edge and eliminates the fun portion.
I think that # 1, # 3, # 4, # 6 and # 8 at NGLA can be hard and a lot of fun at the same time, but, none of those holes are excessively long.
If they were long to very long, they wouldn't be much fun.
I think the same is true for most of the holes at NGLA.
I'd put forth the same premise for Shinnecock.
Fun gets diminished as length increases beyond the golfer's ability.
As a caveat, if "hard" produces a bogey or an occassional double bogey it can remain fun.
When "hard" produces doubles, triples and more, it ceases being fun.