This is all mostly correct.
In my case, the $2,000 would be worth it, since it would enable me to get to the end of a chain of SuperChargers, charge to 100%, go do a bunch of stuff off of the SuperCharger network, then drive back to the SuperCharger network and get back into the chain again. I often have trouble making the distance once I fall off the chain, and this last few dozen miles would make a big difference to me.
But, for most people who don't have these large runs away from the SuperCharger network, this extra 10kW at the top end is almost never useful, or never useful.
There are definitely edge cases where it would be useful even within SuperCharger network or within regular home area use, such as: SuperChargers originally placed far apart; winter driving; windy weather; errands between SuperChargers (similar to my use case above); and errands close to home (be sure not to let the car sit at high state of charge during early errands (if you made this error, immediately drive up some mountains to deplete your battery fast before stopping your car)). But even then, those are rare, and for instance windy weather is hard to know about beforehand. It's better for your car not to upgrade 60->75 than to upgrade and damage the battery by charging to 100% too often, unless
you really need it sometimes, and that is
rare if at all, as
@No2DinosaurFuel said.
I'm selling my car, and I actually consider the top-end buffer a feature for the buyer, since they would not have to worry about charging to 100% in a 60, but if they did the upgrade, then suddenly they have to always limit their charging to around 80% - 90%.