I am building a website and am trying to learn the best practices from Stack Overflow at the same time. This would sometimes involve inspecting the underlying code. I notice that Stack Overflow does not use the new HTML5 form inputs for email and URLs. Are there any good reasons that it is not adopting these new features?
I am not an authority on such matters, but I can take a good guess.
If if ain't broke, don't fix it.
The current method works well enough, and there are probably far more important to things to be working on (like HATS); such a change will typically come when it is needed, and no earlier.