My apologies. I accidentally used the out-of-combat ratio and not the in-combat one.
You are correct in the claim that this change will be mostly a QoL improvement for melee and, to a lesser extent, healers. This is because both TP regen and consumption on a %max/GCD basis are so much larger than for MP -- and it's also why spell speed sees at least SOME use (or, if you are a BLM, you call out its name accidentally in bed), while skill speed is the bane of all that is good in the universe. SMNs problems run too deep for SpS to fix them all.