Again, managing your threat and maximizing your DPS are part of the Classic experience. I don’t know how I can say that more clearer.
Downranking or using alternative spells are core to the game. Rockbiter has always been a threat generating nightmare in Vanilla/Classic and now that Shaman can tank, it’s pushed as the tank weapon enhancement. Both resto and ele have no weapon enchant that is worthwhile. Enhance has Flametongue and eventually Windfury. Why even use Rockbiter in your MH when you can use Wild Strikes off a druid anyway?
Also, you say threat management isn’t the issue and finish with threat being an issue. You aren’t supposed to use the tank weapon enhancement for DPS.