Red-eyed dust bunny
That doesn't follow. How do you crawl into a suit of armor? That's not phrasing anyone would use. And the gorilla suits from Starship Troopers are probably the inspiration for features in the defensive armors, like the jet assisted jumps. The evidence suggests the offensive armors are something bigger.I suspect you're all reading too much into the "space capsule" phrasing, and it was simply to indicate the suits were self-contained environment systems. The bulk of such suits would be more substantial than normal armor (as I suggested, the Heinlein model was that they made the wearer look like a gorilla) but there's no reason to judge anything regarding that as referring to the shape of the armor.
I think that's an excellent explanation. The offensive armors are just barely suits. You crawl into an opening in the back, and stick your limbs into arm- and leg- holes, but the suit's limbs extend much further.The offensive armours sound like they're just a bit bigger than traditional articulated armour. Iron Man style armour is slim enough that you need different pieces for head, chest, shoulders, waist etc. But these offensive jobs are probably so big and thick that the whole head and torso is a single rigid piece. Arms are still articulated, albeit probably kinda stumpy-looking due to great thickness.
A good example might be the Terran Marines, from Starcraft. They have helmets, but they're clearly just big domes welded to the shoulders; they have arms, but the armour is so bulky that their hand only comes up to the middle forearm, so the suit's fingers are operated via linkage. Oh, and most users are welded in, because they use convict "volunteers".
Another example might be the Iron Monger armor from the first Iron Man movie.