So immediately, we can only trace calls within a fairly small distance. Which kinda sucks.
Define small distance?
With a mid-range rating 3 cyberdeck (MCT 360) running signal scrubber in one of your 6(!) active program slots you can trace targets within 100 km from your current location. Not too shabby if you ask me.
With a high-end cyberdeck and a satellite link you can trace any target via low orbit satellites, no matter distance.
Even with a rating 1 cyberdeck that just cost 24k you can use the signal scream edge action to trace no matter noise levels.
Also: assuming the target's commlink wasn't running silent, would you let the decker spot their persona without a test? Regardless of distance?
In this edition matrix perception work just as regular perception.
You typically don't demand the player to take a test to notice a neon sign
But if the specific neon sign they are looking for is not in the vicinity you might still ask him to take the test.
If the target is trying to hide the test become opposed.
Same with matrix icons really.
Rebooting your commlink after every phone call would be pretty impractical, surely.
It depend on the situation and how paranoid the target is.
Remember back in 2020 you had shady people that not only reboot their phones after each call, they even changed pre-paid SIM-cards or even used cash bought 'burner' phones or both at the same time.... Was it impractical? Yes.
But it also made them harder to trace.
...in 6e, that's gone, and you can continue to Trace Icon as long as you can "detect" the target - which I assume means the same thing as "spot".
In 5th edition it was basically only TMs (with Static Veil and or Cleaner) that could trace a target for more than an hour or so before GOD converged on them.
But yes, in this edition you can typically keep tracing a target for as long as you want.
Or at least until the target reboots. Or you are forced to reboot (because your OS getting getting too high because of other reasons). Or the target specifically Hide against you (this is no longer a hacker only action, but it still require that you have the cracking skill if you wish to do it, and knowing what target you wish to hide from of course). Or the target walks into a Faraday's cage. Or you accidentally walk into a Faraday's cage. There might also be some resonance or sprite ability that can cause this effect. I am sure I missed a few more.
I know where you are going with this, but when they track someone in spy movies they typically keep on tracing for far more than an hour... so I don't see the harm in this change to be honest.