the answer is: many of the over-performing builds are attracting a large percentage of the playerbase, and so those players see those builds as the “normal baseline” and anything not S++++ tier (like lightning spear sorc or barrage andy rogue or landstorm druid) just sucks in comparison. but when u say “i dont want to play only those 3 builds” ppl flame u for not “adapting” even tho you are not dumb and you could easily play those 3 builds and “adapt” – it’s just that they miss the point. you don’t WANT to. and imo, you should NOT have to. you should be able to play most any build, and, with 1 or 2 uber uniques (mythic uniques they are called now), should be able to blast through the hardest stuff like Lilith and Pit 101 and T8 Infernal Hordes.
but blizzard sucks at developing games, and made things so effing hard that only the top 3-5 broken builds of the season can do the actual hard content. it’s lame, knowing your skill and build planning all is worth nothing at the very end-end-game because you simply chose not to play lightning spear / landstorm / barrage andy’s.