Re: Why the comparison with wifi?
News just in: lots of cars have had SIMs fitted by the manufacturers and reporting back to base for years. Don't need a new networking technology for that.
There are lots of situations where running wifi over a large area is a real PITA (think crop or animal sensors) but possibly the only choice due to the lack of network coverage. Difficult to see 5G helping there, unless you can buy lease the kit from the networks…
Where 5G might make a difference is where you've got an awful lot of devices in a small area that need to be online a lot: every item in a supermarket. Yeah, I'm not that convinced that 5G is anything other than another marketing excercise for the mobile networks.