Adjustments to MCH design without reworking from scratch

[Ultimatecalibur]

I don't agree to changing that Wildfire in that way, it would probably make it a lot more inconsistent without adding more gameplay.

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.

I would rather have different kinds of utility added to it that doesn't specifically affect damage directly, like CCs, mitigation and resource refresh (or anything else really).

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.