The one concern I have with Machinist

[Buff_Archer]

It does suck not having Second Wind, but I suppose in solo situations we're expected to run away if our HP gets too low. We've got a great cc: ability with Blank Shot (knockback with a 30s cooldown which isn't that bad) which can be followed up with your choice of either a bind or heavy instant (with a shorter, 20s cooldown if I recall) which is a nice set of options since you can use the heavy one if you know some idiot's going to break the bind right after you apply it whereas no one can remove your heavy debuff. (Also works for when a mob escapes that novice Dark Knight and heads for the Asteologian in your party- blast it back and bind/heavy it, difference being that you don't sprint away after. I suppose all something like Second Wind does is buy you a little extra time when it comes to soloing, but it's not like that will make the difference between being able to solo a single-target FATE if it's damage is too high and no ones healing you.

So I guess for when a machinist is up against high difficulty enemies in open world without a party, their best heal ability is going to be Choco Cure.