The Supercharger network is a very nice part of the Tesla experience. When I first got my Model 3, I assumed that non-Tesla charging networks were at least functional, but learned very quickly how much of a mess other networks are.
Any time I've attempted to charge somewhere other than a Supercharger there were issues. Either the charger simply didn't work, or the rate of charge was slower than if I'd connected to a 110v outlet.
Another benefit I often forget about is how I can park my car in my garage or driveway with 50 miles of range at the end of the day and wake up to 300. Having the "gas pump" at home is fantastic and something I often take for granted. It's also hard to convey the benefits to those who don't charge at home. It seems like a trivial thing, and it's even something I feel weird about being so enthusiastic about. I try to tell people it's like having someone fill your gas tank every morning. For about $10.
I've considered replacing my wife's car with an EV that isn't a Tesla, but the thought of dealing with the craptastic non-Tesla charging networks stops me every time. I'm hoping that sentiment will improve as more manufacturers join the network and the overall charging experience improves, rather than decline due to the influx of new vehicles using the network.