You dont really need a datajack. Everything communicates wirelessly. It really serves no purpose anymore.
Your brain can't communicate wireless.
You need a data jack or trodes for that (or an internal commlink / cyberdeck / control rig).
Smartgun have a wirless bonus. so you might want to have wireless ON there.
Eyes dont have a wireless bonus.
Nor does smartlink in your eyes.
Data jack have a wireless bonus so there is a point in having it wireless ON.
Do what you want, but I would have wireless ON in my data jack
Wireless OFF in my eyes and my smartlink
Wireless ON in my smartgun.
This give me +2 accuracy, access to the camera feed to fire around corners with -3 dice, my smartgun have wireless matrix access which give me +1 row up on wind and +2 attack pool, i have DNI access and wireless matrix access which give me eject clip and change fire mode as free actions. I also have 1 noise reduction since my data jack have wireless access to the Matrix... might come in handy if someone tries to jam the wireless signal between my data jack and my smartgun....
and if they manage to jam the signal or if i am under attack from the Matrix i can go wireless OFF on my data jack and smartgun and just attach the cable from my data jack to my smartgun and still have +2 accuracy and access to the camera feed to fire around corners with -3 dice (as well as information about ammo, heat build up etc. represented by the +2 accuracy i guess).
....and IF my device should ever be bricked it take less than an hour and a cheap toolkit to repair it enough to restore full functionallity.