Yes, understood - but that also works on a single circuit as well. I'm not sure I see a functional advantage (other than allowing one connector to continue functioning in some edge case scenario where the other shorts or something) to balancing over multiple branch circuits vs balancing "within" one.Then they will each have their full 60 amps per connector if there’s just one vehicle charging, but will collectively not exceed the total when multiple are plugged in.
There's actual disadvantage in a scenario where you've two connectors w/ say only 60A total available on a given panel/sub-panel. If you put both on a single circuit and allow the Tesla power sharing SW to manage aggregate consumption up to the max (and allow each individually to burst up to that max when there's no contention) then you've made the most of the situation. The way the manual reads (and potentially what the code stipulates) means you'd be required to provision two separate branch circuits at 30A each. In that scenario at no point could any one connector exceed the 30A though!