If it's in a standard, you're not fully standard-compliant until you implement it.
And then what? What if every company says, "Can we fully DRM our website?". Sounds like a good idea, more security, people can't read your JS code, whatever. What happens if the default position becomes everything DRM'd and locked down. That isn't the internet we grew up with.
And to those who say "I won't use those browsers or visit those websites", right ... so if everything is DRM'd by default you're going to not have much choice if you want to read news or visit your bank or whatever.