What is wrong about making machinist good?

[Valence]

I disagree having one of the two charges be single target while the other is AoE with the same potency. In terms of design, this makes zero sense. Either differentiate them enough that they have different enough purposes if one has to be AoE and the other not AoE, or keep them identical for the sake of APM spamm.
In the case of the former, what I would have envisioned for both charges would have been something similar to Fan Dance, where heat blast regens gauss round as normal, and using gauss round has a chance to proc ricochet, for example.