It’s condescending because you don’t understand the fundamental reasons why aircraft are built the way they are, how hydrogen storage works, or just basic concepts but you speak authoritatively as if you do. Do you know why the tank in the 737’s wing is that shape? Because the slats and flaps and their equipment take up the leading and trailing edges of the wing. The fuel is contained in the long, rectangular structural box that runs down the center of the wing. That’s what I’m talking about, you don’t understand even the basics of how airplanes work. It’s got nothing to do with balance. 

And no, it couldn’t be used for cargo. Aside from the structural problems of opening that up enough to pack it full of bags which are just horrifying. Do you know how cold that space would be? I doubt passengers would be ok with having their bags frozen solid. Never mind the bag handling issues as you’ve gotta individually Jenga the bags into the wing every time you load it versus chucking it in the hold.

There is a reason about the only place hydrogen is regularly used as a fuel is rockets, and even that’s not universal. Could you build a hydrogen powered aircraft? Sure, but you’ll also see the cost of air travel increase dramatically. Like it or not, baring governments just outlawing conventional jets entirely in favor of hydrogen ones, no ones gonna buy them.