Adjustments to MCH design without reworking from scratch

[Payotz]

Not necessarily. Cap it at about 6000 potency and it goes from the current "use it with Hypercharge" to "use it when you think your party can do 30 weaponskills/spells in 10s." 30 weaponskills/spells is slightly less than 4 per character during the duration which pretty much every comp can do on average.

It will definitely not change its current use. It will still be aligned with Hypercharge as if you don't, you're gonna risk losing Wildfire Use (and thus potency). It's the same logic as Trick Attack with NIN.
It would be a lot better to turn Wildfire back into its +25% damage form if we're gonna be using it as a TA instead, as most jobs will produce high potency during bursts regardless of GCD count.

Resource refreshing would just mangle the current rotations rather than improving things, we almost have to much mitigation compared to how they currently design fights and CC such as Slow and Blind are going to meaningless in high end contents due to their potential to mess up the tightly timed fights.

It really wouldn't "mangle" rotations at all. In fact, it could possibly introduce more room for optimization or will help a lot in recovery situations just like old Refresh. Potentially being able to skip a Fire 1 for a BLM, giving 2k mana to casters and healers during recovery situations; There's a lot of ideas in that space that can work that will add much needed gameplay to physical ranged.

Slow and Blind and CC in general would be useful in add phases, like E8S(If only Heavy worked there), and mitigating one or two auto attacks between phases is a good usecase for Slow and Blind. Phase timings and what not will not be affected at all with CC, as no matter what, the boss will immediately cast the spell even if their blinded, or slowed. A bunch of good examples of this would be Titan EX and old Flash, where sometimes the blind can actually mitigate Mountain Buster, but it will never interrupt the phase change. All the phase timings are time based now, so whether or not the boss is dying, it will transition to the next phase immediately or force the party to finish the mechanic before falling over dead (E10S post VG2).

The only reason why it's meaningless in Savage and Ultimate is because most of the time, the adds and bosses are immune. They've shown that they can add mechanics like Interject in Savage Fights. We just need more varied forms of it.

I'm not mad at MCH staying as a "selfish" DPS, as it seems to be a niche occupied by at least 1 representative of each group: there's one in the casters as BLM, one in the melees as SAM, etc. Bards on the other hand, would actually benefit a lot for more of what you suggest, to have them out of the limbo they currently are, and being on par with Dancers for what is brought to the table.

The main problem with that is that MCH has been touted as not having the DPS to actually be a true selfish DPS, and it doesn't have that dps due to the "mobility tax" and "utility tax" that the job supposedly brings; When in fact, it's surpassed by Dragoon and Red Mage, two jobs that also have their dps toned down due to utility tax. In my opinion, MCH (and physical ranged as a whole) needs to bring back the utility that was taken from them and add more utility on top of that to justify the low damage the whole role brings. I think utility and the gameplay that derives from that will compliment the snoozefest that is Shadowbringers MCH gameplay, and will add much needed complexity and depth to the job (which is a good thing imo).

I'm not disregarding the problem that is DNC stealing BRD's identity, not at all. It's a part of this big problem with the job design this expansion. The role itself needs to get back to its utility dps identity from its current "DPS, but easier" identity.