Well, if you really like web interfaces that much... yay you, I guess. Most of us involved find them useful for archival access, but sub-optimal for everything else. We sometimes work off-line, we sometimes find ourselves with limited 'net access, and we sometimes find that the central server's gone toes-up and is unavailable. (And I'm pretty sure if I put forth "You just edit all your messages in an external editor and cut'n'paste them into the web form" to the list as a whole they'd hunt me down and kill me....)
The web's good for a lot of stuff. This just doesn't happen to be one of them.