I can't believe I'm defending this guy, but his questions are fair questions, and certainly not dumb.
Why no UHF NOAA channels? For a variety of reasons, such as the reduced range of UHF over VHF, meaning more transmitters might be needed, costly infrastructure for new UHF transmitting equipment, no demand, and a variety of other reasons already put forth in this thread.
Can we get the FCC and NOAA to add UHF weather channels? Probably not, because of the cost, complexity, bandwidth, and equipment required, among probably many other reasons, but if you feel strongly enough about it, contact them. What can they say? Yes, no, or maybe. Or maybe they won't respond at all. Like a boss of mine once said, if you don't ask, it's an automatic no.