It's a PITA that's what.

I think people have given you a lot of great explanations as to why it's a ridiculous idea, but you seem to be dismissing each with accusations or generalizations that an inexperienced biker would make.

If you think a bike as you describe would be better, then build it. Ride it. Enjoy it. If you're just here to complain about how touring bikes aren't designed specifically for your needs, you're in the wrong place.

Isn't there a frame builder section of these forums? Maybe they could give you some more insight with specific details that we may or may not have already touched on.