Hi friend, hope you are well.
Good question, I think it requires a nuanced understanding of what mechanics are making it stand out at top level play, and whether those same mechanics are being utilized at lower ratings. If the mechanics at the high end aren’t being utilized by say, the bottom 75%, then nerfing those mechanics is a valid way to reduce it’s effectiveness at top level play, while having little impact on the bottom 75%.
How you do that would require a rogue player w/a deeper understanding of the spec than I have.
Good / viable to what demographic of players? Does viability to “top ratings” matter when 99.9% of players don’t get there / even try to get there? My overall point was that most specs can attain 2400 in 3s (I think the only outliers to this are Destro Warlock, Fire mage, aug evoker, and the tank specs).