What's some amazing technology they have in Japan that's very normal to them but would blow our minds here in the US and western world?

Not Japan specifically, but I've got say I'm jealous as hell about the snack scene in east Asia.

I generally don't have a sweet tooth, and things like potato chips don't have that umami I like. I try to keep snacks around because I forget to eat, but nothing appeals to me. But man... all those pre-packaged tofu squares, various bits of marinated meat... that's my deal. There's one solid "Asian Mart" near me, I'll stock up a few months worth at a time.

Closest you get in the US is basically jerky/slim jims, which are great but expensive and kind of one note for flavor.