That is, well, because its the time when time matters.
If you're idly sitting on white sand beaches, drinking a mai tai, The matrix actions could take a minute or more to preform. It honestly wouldn't matter. An hour might be pushing it though, but you could go pretty dang high on that. In the end, it doesn't even matter how fast the matrix moves. But there is a reason why deckers don't hack like this isn't there? Something about pluggin your deck in a host slaved thing. You know, Direct connections. The reason why you'd be running with the group.
There is a reason why there are a bunch of wireless bonuses on items. It isn't for you know.. looks. It was there to have something opened for someone to do a bit of hacking on Right?
There is a reason why they've included blurbs in data trais 179 on hacking during combat.
I'm not even on about it being "the worst case scenario" I'm on about it being one of the more common scenarios. Surprise combat is a very common occurrence. It doesn't even have to involve one party sneaking around either. Just has to involve something going sideways, and lets be bloody honest here, when does something ever not go side ways? It might not be orbital laser cannon from space targeting you sideways, but things go bloody well sideways most of the time.
Like some beasty starts running atcha and there is a door between you and it. While the rest of the team pulls out their guns and spells, you, the matrix expert guy, cannot use your main focus to block the beasty, unless you happened to hack a random door. Maybe the door is silent. Then thats a complex action to spot it, And if Xenon is right, then it would be at least one. Then a complex action to mark it. Then maybe a complex action to close it.
As Zhoul has pointed and yelled about multiple times, that drek is slow sauce. Its better to play a diet-sam and just pull out a gun like everyone else with your gun arm. No other archetype really has to abandon their forte like a hacker does. Yes. Even a face doesn't, cause that face could pull out leadership and boost everyone's ability up, while not really focusing outside his specialty. Or he could be a mage or an adept and have some spells, or use adept powers like commanding voice to lay down the law.
And honestly, its pretty simple to make the matrix user able to affect the combat more easily with his specialty. The Matrix. By you know, decreasing the time it takes to perform basic actions, like Matrix Perception. Maybe Hack on the fly/Brute force even.
Note that with Matrix Perception - If you're the hacker, and you're suppose to be watching over everyones gear, and everyone has a gun, commlink, car, glasses, and ear piece (let along whatever else you have. ) and there is 4 of you.. Thats 20 icons to look over.