I don't think you've thought this through. My 2013 S85 gets right about 257 miles on 100% SOC. Supercharging is most time effective up to about the 80% point. That's a bit over 200 miles. And there are 60's and 75's out there that will get less.
There are lots of highways coming off the supercharger-laden interstates and main highways. All it takes is a road trip where you need to leave the interstate and drive smaller highways for some distance to need to spend some L2 time in many areas. There are several routes to destinations here in the Mid Atlantic that way, despite the fact that the Supercharger infrastructure has built up nicely here.
Or it could be an L2 at destination you are using. Or you may be dealing with elevation, weather, or temp. Cold down here can cut range by 30-40% easily. It's not too hard to need some charge when your effective range is 140 miles.
L2's aren't "proper" for a car despite being an EV? Interesting perspective. And for many of the scenarios I've mentioned above, that may be the best resource an EV owner has.
As for "should", nobody (at least not me) is saying Leaf owners "should" not drive anywhere they want. Just don't expect that you automatically are entitled priority to a shared charger. I don't with my EV.
Again with the "unlikely scenario". I suspect you don't travel as widely as some of us do.
And despite your highly emphasized point, there are plenty of non-corner-case scenarios where there is no supercharger to stop at earlier to fulfill that need. "Righteousness" has nothing to do with it, other than some folks apparently making this an emotional discussion rather than a logical one.
Perhaps my perspective is skewed coming from the "Land of Tesla". One would be hard pressed to drive more than 100 miles around here and not have the option of a SC within that radius. I have no experience with your neck of the woods and you make good arguments above so I concede.