Machinist needs help.

[Seraphor]

If you don't make mistakes and the boss has a correct uptime, you will end up in a trap at the second Wildfire.
You will have heat to spend but you won't be able to as Drill and Air Anchor are near and as soon those are used, it's now Wildfire that is a few seconds away and you can't use Barrel Stabilizer as you will overcap heat.

Barrel Stabilizer that used to be paired with Wildfire is now unsynchronized with it at the 2 minutes mark.

There is easy fix for this:
-Barrel stabilizer allowing a free Hypercharge rather than giving 50 heat.
-Wildfire and Barrel Stabilizer fused into one button -> Wildfire triggers Hypercharge for free.
-Remove Wildfire and change Barrel Stabilizer so it increases GCD potency under Hypercharge by a whooping 200 potency (In order to compensate for the loss of Wildfire)

Wildfire is an empowered Hypercharge, nothing more nothing else. There is no "Wildfire combo" anymore and the cooldown is now incredibly boring.

All of these would only serve to make Wildfire even more simple and boring.
At least you now have to be concerned about boss uptime, and if the boss is about to vanish, you need to hit Wildfire yourself to trigger it prematurely, instead of losing it entirely.
That's a mechanic in it's own right.

Also, I have absolutely no issue with Flamethrower at all. It's not useless, and you need to use it wisely, by correctly positioning yourself, and it comes with the potential cost of having to eat AoEs to keep it up.

In general, MCH is about correct timing, and making the right choices on the fly. Removing any of these lowers the skill ceiling, and would just make MCH even more braindead.
They should be adding to these skills, not taking away, to make them more interesting, not just scrapping them entirely.

For example. Flamethrower could apply a stackable burn debuff for each tick of damage it applies, and then the next weaponskill you use has it's potency increased by 2% per stack (up to 20%) and consumes those stacks. Kinda of like a mini AoE Wildfire with a slightly different mechanic.
Maybe then EW could add in a new AoE weaponskill that has it's own cooldown (or shares with Anchor) Noiseblaster, with which to spend this on.
This would also synergise well with Reassemble, which in AoE is currently best used on Spreadshot, due to the other AoE weaponskill simply being a dot.