It got added because it worked extremely well on browsers that implemented it, and it solved a problem that was needed on the site in question, which was very difficult to solve otherwise. I can’t blame a site for using an open standard that works for a majority of its users and which makes the development effort significantly less.
I’m gonna be honest, if they used a feature that wasn’t ready for prime time, it’s still on them.
It got added because it worked extremely well on browsers that implemented it, and it solved a problem that was needed on the site in question, which was very difficult to solve otherwise. I can’t blame a site for using an open standard that works for a majority of its users and which makes the development effort significantly less.
You don’t change standards to fix bad code