In defense of the other System upgrades:
Enhanced Scopes lets you move as a level 0 pilot. That means:
You have full knowledge of the board-state when you plan your maneuver
You will not be blocked, unless you wish to be
Your action economy is guaranteed, unless you are stressed
You become a substantially better blocker
You activate at the same time as other allied ships with Enhanced Scopes.
This is powerful, but not against this high PS metagame. Still, it's worth considering once the metagame shifts.
It's also not that worth it when you can just buy an Academy for 12 pts. Why turn your high value ship into a blocker? It's a waste of points to me.
Advanced Sensors lets you perform your action before executing your maneuver.
You will not lose action economy to collisions or to red maneuvers.
You can perform a Barrel Roll (or Boost with an upgrade) before executing a maneuver.
You become substantially better at arc-dodging, as any chosen maneuver has 7 (or more with upgrades) different flightpaths. Even Koiograns.
This is what made B-Wings deadly, and now the TIE/A can have it too. We won't use it to quite the same extent, as we deal less damage, but hypermobility would allow us to usually get the Range 1 shot we so desperately need.
Also, it would make for an interesting Stall game. Get the 12 point advantage as swiftly as possible, then spend the rest of the game not getting shot at. It works!
Sensor Jammer turns one enemy [{Boom}] result into an [{Eye}] result. They cannot re-roll the result.
If they have no Focus token, or other ability that uses [{Eye}]s, we have simply reduced their damage.
If they have a Focus token, they are now forced to choose whether to use it offensively, or lose damage to defend later.
In the current metagame, I see a lot of people relying on non-action offense, so they can stack up on defense. Sensor Jammer punishes this.
In the current metagame, I see a lot of high PS ships. Sensor Jammer + Opportunist turns this into extra damage for us.
Moreover, the TIE/A has 3 agility, which means that extra damage mitigation turns us into incredible tanks. Our native 2 attack may be piddly, but we'll deal more damage to you than you deal to us!
While this is not that bad, it also isn't that good. First off, they must not have a Focus. If they have one, then it doesn't do anything. So, you have the chance of blocking one of their attacks. Next, when you attack, you still have to roll for it, but get either a Focus or TL of your own. That's alright. You might get 2 hits. If you take AC, you can always take an Evade. This way, you are ALWAYS blocking a hit. Next, you are ALWAYS getting 2 hits in. You don't need the TL or Focus.