On one side, i feel that many of the PTR’s builds are just bad and maybe many people didn’t spend time re-dressing / respec other builds hence putting Hammerdin as the best L95 end-game geared option shifted analytics heavily into saying “Terror Zones are easy cause Hammerdins say so”.
On the other side, Terror Zones as a concept really shines for Hammerdins as they are the most flexible for full zone farming due to the considerable magic damage component.
Worth taking into consideration is that technically Hammerdins are not BIS by far compared to other classes for targeted farming, they can just cover more content.
Realistically, you have other options farming WAY more efficiently with either budget/endgame gear:
Javazon mowing down cows and bosses; Sorcs teleport for key farming, lk chests, seal popping, boss farming etc.; FoHdin > Hammerdin in CS on low player count, losing traction after P3-4; Barbs with find item get more drops than Hammerdin when properly geared etc.
Also, most classes just buff up, go/tele there, spam 1 skill, hold alt for disappointment, difficulty of playing is not really a factor.
Now i would open for debate the following: is the real problem the Hammerdin or analytics or Terror Zones concept altogether?
I would say that Terror Zones seem easy with any geared class but clearly benefit Hammerdin’s magic damage flexibility. However, nerfing Hammerdins only addresses the main thing they’re good at (flexibility), not address the easiness of Terror Zones or inaccessibility of other classes due to immunes.
And last: How would you nerf them? Limit them like other classes to only be good in 2-3 farming spots? Or nerf damage to be useful only until P2-P3?