Actually I'll stick out as a weirdo here but I find Car-Net genuinely useful and use it everyday.
I find the live traffic info really accurate and it pops up on the infotainment or AID navigation screen straight away, and shows the roads as either Green (free flowing), Orange (a bit of congestion) or Red (fuc*ed up ahead). I know a lot on here hate the VW Nav and much prefer to use either Apple Maps, Google Maps or Waze (through either Apple car play or Android Auto), and as excellent as they are for navigating, on a day to day basis the maps don't show in the AID only on the Infotainment screen.
Also, on many occasions I've pre-planned a route or destination on either my PC, Mac or even tablet and just sent it to the car. As soon as the car then connects to my wifi network (more on that below), it immediately informs me that a new destination(s) are available for download and enables you to navigate to them straight away.
I've also on more than one occasion used the local filling station search (with prices) to look up the best filling station to me in an unfamiliar area. Also, things like local and destination weather can be had as well as news feeds (I have about 5 news feeds set up).
So yes, whilst not essential, I do tend to use one or more feature daily.
Now for me (as primarily an Android user as my main phone), I use an app called "Macrodroid" which enables me to create a simple macro so whenever my phone connects to the cars Bluetooth network it sees that, automatically then turns on the phones WiFi hotspot (encrypted), and connects to the car enabling a data link for all the Car-net stuff. Then when exiting the car, as soon as my phone disconnects from Bluetooth, it automatically shuts down the WiFi hotspot. All this automatically with the phone still in my pocket. Been using the app for 2 years now and no issues at all. Even works with a separate macro which is set up for the wife's Polo Blue GT.