Yeah, I guess with the Battlemage build I'll take SI instead of Last Stand.
Thermodinamicity is shit. Cold psi effects cancel out fire effects and vice versa.
I took Thermodinamicity in my latest finished psi playthrough, and while it's true cold effects cancels fire's, the feat is still useful against groups and for crowd control. Provided you have enough psi, and especially with Premeditation, you can cast churn out cryo orb -> pyro orb -> cryokinesis -> fire spray on multiple different targets all in one turn. This is especially useful in big fights, especially when defending expedition camp against native and/or invading the natives/pirates base.
However, that one has Tranquility + Meditation. Maybe replace ThermoD in both builds with Pyromaniac instead?
Also get 35 initiative if you plan on doing Faceless Commander
Kinky.