If you read about the droid control ship, it does exactly what I mentioned, it broadcasts a ' master control signal' to the droid army and navy. It's not described what that signal is, but obviously if it has antennae, it could be a radio broadcast. It also could be some type of similar technology that functions in the same manner as our radio waves, but has in-decipherable code. Even though the droid army uses a system to control their droids, the organic species don't typically have wireless equipment outside of various ranged communication devices. In any case, the systems are either impossible to slice, or the technology to slice radio wave systems isn't in existence. The reason being, is that army would be totally wiped by one Republic Slicer if that were the case. I'm sure the Republic would've tried slicing the systems prior to using clones to fight in a massive war.
From the mentioned of targeting computers, I'm going to quote myself:
There are targeting computers and targeting assisted systems, but for small-scale space combat, we see analog piloting and firing of weapon systems. The Falcon had ball turrets like B20 bombers, X-Wings had target assisting computers, but everything was fired on the control stick, same with Airspeeders and Tie-Fighters. I'm sure droids have internal targeting systems, but all human vessels that we see outside of capital ships, fire directly from the control of the pilot or gunner.
The videos you just post show that this is the case. For one, both Han and Luke are mixing time between looking at the targeting systems, but at the same time they are using their eyesight to make the shots. You can clearly seeing them looking at both. The targeting system is also demonstrated in the Trench Run at the end of a New Hope. They are literally looking around for other fighters like top gun and firing their blasters like WW2 Dogfighters. It's cinematic and that's just the way things are in the StarWars universe...
The argument isn't that there are no targeting systems in StarWars, rather, that they aren't reliant on Targeting Computers for dogfights. Yes, they've got scanners and computers that assist with targeting, but the actual gunning is still very reliant on hand-eye coordination. To demonstrate, look at the guys trying to hit the exhaust port with targeting computers and how the pilots brag about hitting wamprats from x distance out using a Skyhopper.
I think what were doing is saying almost the same thing. There ARE wireless communications and there ARE targeting systems, but how they function is different in their entirety to similar technologies in our universe. There's no 'wifi' and targeting computers may help with gunnery, but it looks more like an upgrade to the check rather than a boost die..