Well, in Fallout: New Vegas the NCR had kicked The Brotherhood of Steel from the Helios One solar power plant and had gathered some power armours as tropheys. Since the NCR had no means of teaching their soldiers the Power Armour Training, they’ve simply stripped off the electric parts from the armour so that it could be worn like a shell. This resulted in the loss of +2 STR bonus from the armour, but the -2 AGL stat present in the original T-45d PA remained, some minor Damage Treshold reduction (22->20 for the bodysuit; 5->4 for the helmet) and minor weight reduction.
So it’s not really immobile unless powered. At least, the Brotherhood armour designs. Gameplaywise, you’re still able to run around like crazy in it. It’s not that realistic, but anyway…
Just couldn’t not post that. Anyway, the link doesn’t work fore me, somehow. And the doctrines… Well, it’s not really about soldiers themselves, since a human’s ability to haul gear is kinda low, but about vehicles and stuff. Point is, the weapons have surpassed reasonable armour long ago, so it’s generally better to avoid being hit with shells/rockets/missiles as a whole, and that requires some mobility/agility and some of the weight freed from removing or not adding armour is used to mount various defensive gear like anti-missile MGs or cannons, infrared floodlights and stuff.
Hm. Yeah, I’ve been talking about tactical mobility. Not about agile movements like doing somersaults or hitting bad guys like a movie ninja.
Anyway, here’s another media piece just for the topic. No propaganda.
Well, dust could also be lying on the ground, and then one day the heavy boots just step on it, and…