There was some discussion about this deprecation as the
Techpreviews (Win2k/NT4) did support literal url's.
The XP version and up though won't support it to overcome
one major 'problem': website 'designers' embedding IP's
inside websites to 'speed things up' (go figure).
perfectly reasonable thing to do. browsers that don't support it
are broken.
It's perfectly reasonable to not support RFC2732? or?
it's perfectly reasonable for sites to use address literals in URLs
referenced by their web pages.