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Waiting for my shill money from Spiral Arm Studios
Because their generator is incorporated into the armor itself, while PA is bulkier relative to the size of the armor and gets put in a backpack.
Self-proclaimed evil Cat-person. Dues Ex Felines
Cato Sicarius, after force feeding Captain Ventris a copy of the Codex Astartes for having the audacity to play Deathwatch, chokes to death on his own D-baggery after finding Calgar assembling his new Eldar army.
Or the design of the terminator armor integrates the power source in order to protect it in the most extreme environments you'd deploy TDA in. The TDA is a complete system where even the weapons are stuck on.
Regular PA marines do sometimes lose their backpack or have their power supply otherwise knocked out, but leaving the design like that is a necessary compromise. If they too had it integrated a jump pack or heavy weapon ammo/power pack would add even more bulk (or be impossible to attach) and they couldn't take the pack off when serving as vehicle crew who need to lose the bulk, using vehicle internal power instead.