Counterpoint: Nearly all of my (thousands of) users use whitespace in basically every single folder name and file name every single day (which are usually title

Counterpoint: Nearly all of my (thousands of) users use whitespace in basically every single folder name and file name every single day (which are usually titles of papers or experiments), and none of them ever have any problems. When writing software I always make sure that all my test data has spaces - and not just the normal one but weird unicode ones too - in paths and filenames.