Even this example is terrible, I don't "remote unlock" my Tesla, it's just unlocked when I get close to it. It used to be 95% reliable (not great), but now that they added an Apple Watch app, it's 100% reliable (either my phone or my watch unlocks it via proximity).
I wonder how much is the Tesla and how much is the phone. I used to have 98% success with just walking up to my Model Y, phone in pocket. These days it is more like 80% and sometimes it can take over a minute before the car accepts that a "key is present", even after manually unlocking with the app, sitting in the drivers seat and having an established bluetooth connection that is playing through the car speakers.