Wooo calm down tiger, we all friends here
In a strange way mate, i agree with you. There is no automatic distinctions, just personal opinion, and unless your prepared to completely disregard a form of music altogether its near impossible to find one format instantly more valid than the other (for example; just listen to jazz funk trios which obviously your only gonna see in a band format), although i think the crazy frog is the exception to the rule.
Playing records is a live action but in no way is it a live show. To be honest i think calling djing "live" is selling it incredibly short.
Djing (for me) is about rebuilding and remixing on the fly, about showcasing your own interpretation of the music, and most of all creating a engaging canvas of mood and texture on the dancefloor. (dont remember which dj said it but i always have "djs should keep one foot in the botth and one foot on the dancefloor" stuck in my head)
Playing the same music "live" is to confine yourself away from the freedom djing opens up.
So if you count what i just said, i kinda agree with you.
Here comes the but....
Although i also agree with you that it should never be all about the visuals, it should be the vibe of the music, you cant deny at the same time it does have an impact. Unless your blind, in which case whether its a band or a dj makes no mind

Thats why peeps using purely laptops get my goat. Just seeing a guy stand there hitting some buttons i end up feeling abit cheated. At least someone manning the decks has the element of improvasation which makes each set an eclectic and ultimately unique experience.
And yeah, maby live bands will never nail the sound exaclty, but thats no reason to count it completely out.
Most bands i know play their own material anyhow, which is off course completely open for their own interpretation. A local live dnb band i know play a different mix of their tunes for each set, which i thinks pretty cool.
Plus the energy i get from being back to back with someone on the decks is enough in my mind to think being in a live band would be a fucking cool time.
Hmmmmmmmmm....i think what this comes down to his definatly personal preferance. Some peeps enjoy the idea of a seeing and getting jiggy to, a live band playing music that traditionaly isnt done by bands, some people dont.
Thats a good thing though, the day everyone agrees is the day no one thinks for themselves.