That, and the boosts given to Primal Kyogre's stats were baffling to me. No boosting its speed and half of the Primal Reversion's 100 point increase were given to attack (to a pokemon that has a rather shallow attack movepool and its new signature move is special based). They are a reverse of Primal Groudon's stat increase because its special attack gets boosted by 50 points, which doesn't make Precipice Blades better because it's attack based, but here it hurts considerably less because it actually has a rather solid special movepool (Earth Power, Solarbeam and Fire Blast). Giving the right stats boost to Primal Kyogre would have been the better choice, instead of doing reverse stat boost because they are a duo.At risk of getting a little OT I think Primal Kyogre was, like base Groudon before it, simply a victim of type and weather interactions. The problem with the Ground/Fire and Water dichotomy is that it's never been mechanically balanced within the game itself - Ground and Fire might be associated with a diametrically-opposed philosophy to Water, but, well, Water simply beats it (as it should, mind). Desolate Land and Primordial Sea are perfectly logical extensions of the base abilities of both Groudon and Kyogre, it's simply that the former ends up being far more mechanically important due to Groudon's Water weakness.
But yes, Primal Kyogre and really normal Kyogre are still pretty broken regardless.