There are places where nouns are the same in their plural form and can be both countable and uncountable, in which cases it removes confusion. “Things would be better with less media” means something different to “things would be better with fewer media” (although admittedly this is a pretty rubbish example off the top of my head — I’m sure better examples can be constructed). It doesn’t make it crucial to have the distinction but it does mean the distinction isn’t “pointless”.It's normal usage to use 'less' when talking about money, even though it comes in countable units. A proper grammar nazi needs to know about these exceptions.
I have recently come to the conclusion that the word 'fewer' is pointless and am campaigning for an accelerated end to its life.