Teleporter/Rocket jump, the idea is there but does it fit with the thematic of a machinist?
Grapling gun is much closer to the thematic.
The problem, visually, is that the rocket jump would propel using a rocket on a very short distance.
Wouldn't it be visually awkward? Everytime a rocket jump is suggested, I just picture Diddy Kong's Rocket Barrels.

Wildfire needs a change. Copying the pvp function is a good start but it needs more. Wildfire is weak, visually disappointing and non existent gameplay wise.

Flamethrower trust me you'll regret suggesting Flamethrower interacting with BioBlaster.
Flamethrower itself is clunky and needs a complete rework. You may not realize it since it's barely used but if it fits in a 1/2 target rotation, you'll quickly realize the mistake.
FT ticks are unreliable, its damage are hard to track, the ability is simply not fun to use and much more effective as an emote, standing still isn't fun and not possible for a long period of time in harder content.

Settings your teammates on fire is nonsense and counter-intuitive.
If you have an ability that does damage OR utility, how do you think it will be used? 99.9% of the cases will be damage.
It's damage AND utility? "Oh guys please stand in my flamethrower so I can hit you and the boss(es)" + mechanics.
DRK are already complaning that TBN is tied to damage resources, let's not repeat it.

Chain saw best case scenario would be a rework, minimum is to change its name to Buzz saws and reduce the fall off as it's the only natural AoE in MCH kit.
It has nothing to do with Chain saw, many MCH players are disappointed with it.