Are you Japanese and can be provide more insight? I ask because it's common online by non-Japanese (especially on places like Reddit) to make wild generalizations about who Japanese people are because they visited Japan once for a week or want to visit Japan someday.
In my experience of having lived in Japan, I find this simply not true. Of course this is my own anecdata. Physical contact, from my experience, is seen as a more intimate gesture. It depends on the nature of the relationship. In places like America, lots of people would give a hug (at the very least a one arm hug) to their friends when they're parting ways. Japanese don't do that ever from what I've seen, they'll just wave goodbye to each other. But I have seen plenty of hugging, hand holding, and other public displays of affection among those who are intimate.
In my experience of having lived in Japan, I find this simply not true. Of course this is my own anecdata. Physical contact, from my experience, is seen as a more intimate gesture. It depends on the nature of the relationship. In places like America, lots of people would give a hug (at the very least a one arm hug) to their friends when they're parting ways. Japanese don't do that ever from what I've seen, they'll just wave goodbye to each other. But I have seen plenty of hugging, hand holding, and other public displays of affection among those who are intimate.