The big difference between the variations you mentioned and high tech is that they have another variation that is so obviously overpowered (and deserves nerfs). That's not the case with Jacqui, high tech just sucks. One of these things is not like the other one.
Besides the point, using the variation system to justify a competitively terrible variation is terrible logic.
Someone please pick up this OP high tech character I keep hearing about. Show me how to play the Takeda, Johnny, Mileena, Kano, Predator, Ermac, and Kotal matchups.
Lack of tournament winnings and placements aren't good enough to call a character bad, but when you don't even see anyone using the character in a competitive setting it certainly makes you take pause and think why?
High Tech is a high execution character with some serious flaws which prevent her from being a viable tournament character.
Please, if you or anyone else is conviced she's OP, pick her up and show me. I'm tired of all this theorycrafting bullshit along with block string videos where the opponent isn't ducking or showing situational 60% combos which require two gauntlet sparks and corner positioning. Show me footage of you doing well againsts tournament players who are well versed in the matchup where you don't get counterpicked to oblivion. Show me you taking sets off Takedas, ermacs, Mileenas, kotals. If your character can't deal with some of the most common tournament characters good luck.
For the amount of time and effort required to use High Tech, she should be more than a niche counterpick that works mainly because the opponent doesn't know the matchup rather than actually being a better choice than full auto and shotgun.