I am having trouble seeing what you're claiming. Are you saying that there are not thousands of characters in Japanese and Korean because they borrowed from the Chinese? If so, I'd say your correction is misplaced. These characters must still be taken into account for a charset to be used for these languages.

In any case, I found many of your comments to be irrelevant to the question of how many characters must be used in a language. For instance, the difference between Cantonese and Mandarin pronunciation doesn't have anything to do with this issue. Nor does Chinese origin.

edit: I just spent a little time researching Korean (which I know much less of than Chinese or Japanese), and now I understand more what you were saying about it. However, it seems to me that each "super-glyph" as you call them counts as a character, as far as any charset is concerned. The fact that they can be broken up into constituent glyphs is irrelevant.