You're arguing technical merits, not user benefits. It's the 'set once' part that's the trick. It's really,
really fucking hard to get someone to set something new one time, even if it is a good bit better.
Personally, I wouldn't start using a new tool for the benefit of the web in general when there's an immediate benefit to me for using a competing product. There's got to be a user benefit besides improving the web.