True that it have been in the game for the longest time and it's a valid strategy but so was RNGs and BLMs. Once the strategy reaches the masses and catches SE's attention, it's almost certain there will be some adjustment.
There really isn't any kind of pattern to the way SE adjusts things that aren't blatantly unintended (unlimited TP gain from relic knuckles WSing). If every really good strategy is supposed to be nerfed by SE, why do SMN LV70 BPs still generate TPless damage? I don't really know if you can count the BLM nerf as much of a nerf, I don't think most groups have had to alter strategies involving BLMs much from before.
I just doubt that a strategy that involves a specific set of merits + a very high level of gear + multiple extremely rare items will ever "reach the masses," and again, if they want to make it so that this strategy can't be used on new HNMs they should just adjust the new HNMs, not nerf the strategy.