I can see why they wouldn't want to have her just use the Master Jailer armor. It was broadly capable of matching Supergirl, that's probably a little too much oomph. The justification would be "the stuff is too sophisticated, we can't really get it safely operational."
The exoskeleton from the finale is a different story, that'd be fine. Hell, we still don't know for sure it *wasn't* DEO tech.
Oh the exo armor that non was controlling alex in. hehe you'd think alex would want nothing to do with that thing again. if it was me and it was used to hurt one of my siblings i wouldn't.
I don't know where that thing came from. but I thought it was a creation of Non's just to pit the sisters against each other. I don't think he put much though about weather it was durable or tough enough . only that it would hurt kara cause she'd have hard time fighting her earth family or for ever blame her self for hurting her earth family.
as to the master jailer gear. my thought's were more of the reverse engineer (the master jailer gear)) it sorta thing.
The only real reason I mentioned it, was due to when kara's aunt dieing via that sword made of kryptonie .
you mentioned the exo suit and the kryptonite sword which looks like machete when you look at it.
But the thing is, with how both superman and kara like to handle things. think about it? about how both superman & kara like to operate. they don't like to use leathal force from the jump. The kryptonite sword is pretty much too much lethal force.
while the master jailers gear was for capturing & subduing minus that
Guillotine at his hideout.
and I don't think super and kara like the excuse of war with certain that aren't really out right and clearly that.
yes I'm aware kara's aunt alura was about to kill j'on . but think about it. Non also said indigo that alura wasn't willing to killing the human race but co-exsist with them even though she was about to waste j'on did alot of what she did that said other wise .
And I think a reversed engineered capture device's would be more accepted by both superman and kara to allies fighting along side of them as first approach tactic's rather then that sword of which superman is having issue's with j'on over.
I get view that j'on mean's cause it's like what happened with doctor who" when the children earth event happened and he wasn't there and captain Jack Harkness his allie lost his grand son who was a child under 10 year's old. super man and kara can't and won't always be there, so they can't always claim this.
and i see superman reason so the best alternative would to have device's that aren't as lethal that krytonite like the jailer gear. reversed engineered used for capturing , subduing & retraining purpose's only. since this the issue with superman and Kara about the kriptonite and it's over lethal use. and it'll avoid alot of problem's of the overly lethal kind and is a good alternative. and to have that gear so only certain people can use it.
Like in Alex's case only she can use that reverse engineered gear. if the actul master jailer gear is so overly sophisticated there's alway's reverse engineering and bio metric DNA tech .
I'm sure if she had her science teal look into it and had Winn on it it's possible .