Starfinder Power Armor is currently just a curiosity in the rules. Some fleetingly interesting frames and rules that mostly are just place holders for future splats since there's currently not enough options for a PA build to be remotely considered.
However, lets pretend for a moment that some people are trapped at say L2/10/15 and that PA is a possible and viable choice. What's the niche PA is intending on filling? It's certainly not doing favors for CC Soldiers or Solarians who will be investing heavily in strength and thus outpacing the inbuilt strength mod the frames have. Ranged combatants may find the weapon mounts amusing but are unlikely to appreciate the lower dex caps they have to AC. Other classes (gun solarians, envoys, operatives, drone mechanics, and the casters) are pretty much dead in the water due to the extreme feat requirements (2 for PA +however many you want for Adv melee, longarms, and/or heavy weapons)
The only places I can vaguely see PA being palatable are for exocortex mechanics and switch hit soldiers where they're MAD enough to appreciate the fixed strength mod but they still run into issues with the dex cap.
And this is without going into the other disadvantages PA has already (batteries, possible size issues, WBL issues to arm the thing and have a decent set of light armor under it).
So I open this to the rest of you. What's Power Armor's purpose supposed to be? At the moment it simply doesn't look like it fills any niches and even if it did, it's simply far too expensive to take advantage of the few pros it does have.