[blattimwind]

Similarly it is basically impossible to buy good files today, because they're all somewhat dull and don't last. I have German, French and Swiss made files from well over forty years ago, which I received in their original wax paper packaging. They are much sharper now and seem to last longer than what I can buy new from the same German manufacturer today.

It is like someone forgot how to make proper file steel. Real shame. You'd maybe expect them to get a little bit better, for them to last longer, because more modern steels and better process controls for heat treating etc. may be used, but evidently this isn't the case.