So basically the Steam Deck is already "sold out" until next year. You can still be added to the queue but you are now looking at Q3 2022!!!!!
It's possible that Valve could make a lot more but they want to do a small number at first too see what people actually think about it, we are at the part where people want one but what about after they get it? Will those without one still want one?
Which makes me wonder about other regions, yes they will add other regions and stuff but seeing how this is already back up to Q3 where will the stock for the new regions come from?
As for Nippon, one if the criticism seem to be about the size and how it's "American sizes" things in Japan tend to be smaller for a number of reasons (look at manga, it comes form Japan and by standard they come in a small physical size but in the west manga are physically a lot larger.