If you’re only loading data to access it once, then yes, but it almost never is the case - some specific programs might do it, but OS definitely caches pretty much everything it can in RAM for subsequent access - Linux, for example, fills unused RAM with cache

No, it proves that if you’re getting killed anyway, it’s a wise choice to pick the less painful option

The question isn’t why you should use it, but rather why all these things you’ve listed are still using it.

We all know that transition isn’t easy, but being proud of using the inferior system is weird.