External ST

GURPS Supers pg 79 mentions this meta-trait under Fixed ST under Exoskeleta. It is meant as an inherent trait of objects as characters:
:"you provide equal total ST to any wearer"
It is essentially "ST without HP" at 8/level the sum of Lifting ST and Striking ST.
The pricing note is bodily ST plus device's ST sums to total effective ST.
The 0% modifier of it involves how it operates as a Gadget (whose modifiers are otherwise the same)
*when "different wearer acquires the armor, or a copy"
*total ST doesn’t change
*if the new wearer is stronger, or weaker, the armor provides less additional ST, or more
*its point cost is lower or higher for that wearer
So for example, an exoskeleton with Fixed ST 100 [800]:
*a ST 105 god doesn't need to pay anything. He can only operate the suit at ST 100, but that is completely avoidable by not wearing the suit, so it is not a disadvantage!
**conversely, if operating the suit at it's reduced ST was REQUIRED for using some other benefit (perhaps the suit's DR) then it might make sense to define "Reduced External ST" as a temporary disadvantage limitation modifying the cost of the other ability lower
*a ST 95 god only needs to add Fixed ST+5 [40] to represent the ability to operate that suit
*a ST 5 dwarf needs to add Fixed ST +95 [750] to represent the ability to operate that suit
Why this is 0% is probably because
*"powerful thing to lend to my weaker allies" benefit has "powerful thing for my weaker enemies to steal" drawback
**example: if you are a ST 99 character with Fixed ST 100 power armor, you take "External ST +1" [8] to represent it: you can lend it to your ST 10 ally and give them +90 ST [720] (it's far more useful for them than for you!) but this also means your ST 1 enemy who filches it can suddenly attack you with ST 100 as well!
*"weak thing for my weaker enemies to steal" benefit has "weak thing to lend my weaker allies" drawback
**"External ST 1" for example, only benefits allies/enemies who are ST 0.
If armor is bought as Ally with Payload and wearer needs to crawl inside to use it:
*in that case Granted by Armor is a further limitation reducing the cost of External ST.
**this is the same value as Granted by Familiar from B38 so presumably the armor is considered a familiar but perhaps with some of the criteria changed (since you do not normally need to crawl inside an ally with payload to use their powers!)
***the functionality of GBF changed by DF Allies though
category:Advantageous meta-traits