0.75 isn't game breaking, but it is still reasonably good. That's more than BLM, SMN, MNK and SMN bring while only being weaker than SAM (and MNK at the highest levels).
The issue is, the dummy difference between BLM, SMN and RDM is so insignificant that RDM will pull away in pretty much any fight where you have to move a few times. RDM is also much less strict in every fight. Lower skill floor means the average player will be doing much better with RDM and lower skill ceiling where someone who is moderately good can get the most out of the class and do comparable dps to people who have absolutely mastered others.
Yeah they are buffing BLM (and I hope to god SMN too) but that won't fix that RDM is the only class that synergises with the physical classes which outnumber the casters 2/1. You are much more likely to have 3 physical DPS (and the tanks) than 3 casters (and tanks will be producing more damage than the healers). Couple that with the amount of damage it does relatively easily and the fact it can save runs in ways other dps can't and you have a textbook imbalance. It most certainly is Low risk High reward. If you couple RDM's damage and embolden-
Actually let me show you. These numbers are the 75th percentile for Lakshimi and Susano from about 50,000 parses:
SAM = 3604
RDM = 3371
NIN = 3327
DRG = 3141
SMN = 3122
On a regular 75th percentile susano run rDPS (about 18,750):
RDM + Embolden = 3511
NIN + Trick = 3645(!)
DRG + Litany and Dragon sight = 3,322 (kek)
+ disembowel on a 75th percentile brd (roughly 4% dps) = 3448
SMN + devotion = 3148
While difficulty is relative to player and fight, there is a fairly general consensus on which classes are harder and more inflexible and those that are easier and more flexible so factor that into these DPS numbers and then factor in any other utility (raises, defensive, agro management) to get an idea of the current balance. They wont nerf RDM but they better have some damn good buffs to make this more fair.
Note: I don't think they should balance around difficulty because thats relative as I and other have said, but they should balance around how the resources get affected by mechanics and how many mechanics savage is gonna have (because well, its savage) so classes that don't have timers on a lot of their buffs and resources shouldn't have high ceilings.
EDIT: Might aswell do every other class:
MCH: 3103
BRD: 3163
MNK: 3365
BLM: 3238
MCH + Hypercharge: 3313
BRD + all the shit BRD provides: 3556
MNK + Brofist: 3486
BLM + nothing lel = 3238