Wouldn't it also be difficult to work in 16:9 aspect ration unless you enjoy seeing all the anamorphic widescreen video squished horizontally (so everyone looked tall and thin) into a 4:3 monitor space while editing?
The end result could still be stretched horizontally back to 16:9 for anamorphic playback, but while editing this might throw you off....and any text you added while doing 4:3 adding would look squat and fat when stretched out to 16:9.
It still would be fun for fun's sake, though.
