Having been building websites since the mid 90's, I think the biggest challenge with that is actually breaking existing sites. Nowadays when you start a new site you almost always start with CSS, but that wasn't always the case and even today there are still sites that use the default styles as a baseline and just tweak as they go.
If we replace the default styles, a ton of sites are going to look very different than they were intended. We could do an "opt in" though that should be very easy to declare (similar to new versions of HTML, such as HTML 5) and get you on the new default style. I think that would be great!
If we replace the default styles, a ton of sites are going to look very different than they were intended. We could do an "opt in" though that should be very easy to declare (similar to new versions of HTML, such as HTML 5) and get you on the new default style. I think that would be great!