DC fast chargers, like superchargers, have attached cables. They kind of have to, nobody's going to carry around a 300 amp cable. They're heavy and bulky.
AC chargers, which are in the 10 to 32 amp range, sometimes have attached cables. The ones that don't just have a type 2 port, so you need your own type 2 cable.
They're a handy thing to have sometimes. You can always get one later if you need it.
Most of the charge stations around Adelaide have a type 2 socket, so anyone wanting to use the charger needs to supply their own cable. There are a few around that are a standard 15A outlet, you'd be able to use this type of charger with your standard cable, but it won't be fast charging.
Where are you located? And which vehicle are you looking to buy? You might be able to find a more reasonably priced cable from elsewhere.
Looking to get 2024 Polestar 2 AWD in Sydney
Are the ones on Amazon for $300-$400ish Type 2 to Type 2 cables safe and reliable? The one the car manufacturer is trying to sell is $1300, which is 3-4x as exxy.
You're in Australia? You probably want one of these cables from EVSE for $230. They have a good reputation and fairly low prices.
A three phase 32 amp cable will do 11kw (3x 16 amp) on a three phase station, or 7 kw (1x 32 amp) on a single phase station. A three phase 16A cable can only get you 3.6 kW (1x 16 amp) on a single phase station, which aren't common but you may as well have it.
Related: the EVSE Model 3 page
Edit: the Tesla cable probably has the button on the handle that makes the charging port pop open. For a thousand dollars, I think I'd just open the cover with my hand.