You evidently miss the point entirely if it's about "raises you might have to do", the fact is, that prior to 5.05 RDM was MP negative.
Being MP negative only matters if a fight lasts long enough for you to run out. In my experience, it never did.

Just because you claim you were not having MP problems before doesn't mean the MP reduction on RDM is not an improvement.
That's exactly what it amounts to for me. It doesn't change the way I play and it doesn't affect my level of DPS output. There's no improvement.

You could make RDM's attack spells all free and it would still be the same thing.