Yes, math is important; no one has ever argued otherwise. Still, this alleged distinction between "semi-major" and "minor" is a fruitless avenue of debate. I don't have any evidence that more quizbowlers are more interested in math, but if that happens, then let them write the math questions they want to write. If there's a natural demand for this, the game will provide it; there's no reason why we need to mandate 0.5/0.5. Just to be clear, I'm not opposed to such a distribution if it ends up being the case in some tournament, but I think imposing it top-down is pointless. I would be worried if a tournament had no math, but not having a math question in a single packet is not a "huge oversight."However, I still think that math is important enough so that it should be considered apart from the minor sciences. Math is a huge, important field, and more and more quizbowlers seem be becoming interested in it. I think that, while there are practical limitations to what can be asked in math, we should nonetheless strive to seek higher representation for math in the distribution. As such, I think that math should be considered a "semi-major science" and that we should mandate a 0.5/0.5 distribution for it within the 4/4 science distribution. I think that not having at least one math question (tossup or bonus) per packet would be a huge oversight.
I continue to insist that this is a solved problem that people seem to be continually resurrecting for no obviously good reason. The current distribution is fine; it allows some latitude and accommodates a lot of different players. We don't need to go out of our way looking for imaginary problems to fix when we've got something that works quite well already.