Wireless bonus does not list all wireless functionality a device have. only extra bonuses.
There are a lot of wireless devices that don't even have wireless bonuses at all
(but have wireless functionality)
A commlink, for example,
commlink does not even have a wireless bonus at all
...does that mean commlink dont have wireless functionality?
-Of course not!
SR5 p. 360 Wired Security
Wired networks are still vulnerable in many of the same ways as wireless networks. If a wire is breached and tapped anywhere along its length, the signals can be intercepted and retransmitted via wireless anyway.
How do you breach and tap a data wire?
- With a data tap....
TM (or a decker) use wireless data tap on a wired network to access the network wireless.
So get a wireless connection to a wired (wireless OFF) device is not an issue.
However, to get a direct connection you have access the data tap with a cable (to your cyberdeck).
SR5 p. 440 Data Tap
Any device directly connected to the data tap also has a direct connection with the devices on either end of the cable
Then again, a wired (wireless OFF) device does not have access to the Matrix
Hosts only exist within the Matrix (hosts can not exist outside of the matrix)
SR5 p. 216 Host
A self-contained place in the Matrix. Hosts have no physical location, as they exist purely in the Matrix cloud.
So,
while hacking wired networks you don't need to establish a direct connection to bypass host ratings.
This all mean that a TM does not have any harder time snooping a wired network than a decker have
...probably also why the TM archetype on p. 122 carry a data tap
However, this might also mean a TM can't establish a direct connection with her Living Persona to a wireless device slaved to a high rating Host by using a data tap or a wire attached to the universal data connector of the device. THIS is where TM's lack. THIS is why TM's, imo, should start with a "skin link" echo per default. That let them establish a direct connection to devices they physically touch.
Since using a cyberdeck with a direct connection bypass host ratings and since TMs can use the same hacking skills while on her Living Persona as if she is using a persona formed on a cyberdeck (new in SR5) a TM can use a regular cyberdeck if she want to hack devices slaved to a high rating host. it is a nice workaround, but imo not good enough.
some claim you might get a direct connection if you use a living persona, a cable that attach one end to the universal data connector of the wireless slaved device you want to hack and the other end to trodes you have on your head... but i don't really find any support for that in the book.