Far as I understood it, Tidal Wave Shield dropping directly is an intermediate fix until the next patch (today's patch?) where you can upgrade both items with 1 mirror - so back to 95 drops, but just 1 mirror required.
Now that you point it out, it does seem a bit unbalanced that Paladins have to spend 2 oils on their weapon combo while everyone else need one... same issue as with the mirror, no? Same fix sounds sensible to me.