The problem with SotW was that it did all that damage in 1 GCD, and it needed no special preparation. Everything else in the game that does as much or more (e.g. the SV hunter artifact ability beats SotW easily when specced into Mongoose CD reset) needs some preparation. And they balanced only looking at data from instances, i.e. nh, hc, mythic. Much data from mythic+ and raids wasn't even available yet. Only looking at that content, with everything being a burst aoe fest, the spell was too strong and NEEDED to be nerfed. If the spell would have been "50% damage of it instantly and 50% over 15 seconds", far fewer people would have complained, and possibly wouldn't have been a nerf. But our aoe is still strong, just the ability is uninteresting now, sadly.