What's the deal with holding hands?

In a lot of anime and manga, a guy and a girl holding hands seems to be a big deal for them. Yet in the US, hand holding is pretty much a nonissue and most of us did this when we really didn't want to do it at a young age. Is the holding hands thing just an anime thing, or is it actually a big deal in Japan?

P. S. Now nobody should be holding hands, because of COVID-19, but I mean in general.
What's the deal with holding hands?
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