I’ve always thought that it should be taught in schools. It was designed to prevent misinterpretation. And that’s when I want to use it. As a recent member, I love being able to call HR and spell my name ONCE and have it understood.
I used to work with a guy (recently passed) who could string together the most obscure words to do a phonetic spelling over the radio that would leave dispatchers in stitches, or say some complex eastern European-type name and just say 'usual spelling'. It's a learned craft.