I don't think we're in disagreement except on the point as to whether DEF FN was a useful feature or not. It's certainly useful for numerical code. Personally

I don't think we're in disagreement except on the point as to whether DEF FN was a useful feature or not. It's certainly useful for numerical code. Personally I'm kind of impressed that it existed back then at all, as well as the simplicity of original BASIC that enabled regular people to write useful programs, nearly 60 years ago.