Bitcoin being accepted as legal currency in Japan and South Korea aren't... legal? Or do you mean, you can't pay most lawyers with btc? Actually, I'm sure you could probably pay off a judge/politician easier with bitcoin than cash haha.
Sure, you can use bitcoin as an currency, this wasn't my point. My point was on why would you use bitcoin in your business if it just doesn't have any advantages over other payment solutions?
What are the technical developments of XRP, ETH, and EOS that surpass Bitcoin? It would be nice to know now, rather than a year from now.
The main thing that XRP, ETH and EOS have that bitcoin doesn't is potential. Both their initial concept and software framework are more complex, specialized and have a lot more room for development. The development of bitcoin is stuck in it's own tight little room of dogmas, that repeat unchanged in these echo chambers for years. With bitcoin, the eventual failure is certain for me - not the mater of "if", but "when". Luckily I still can be uncertain with those other three, and I'm constantly on the prowl for new competent teams that have potential ideas for new crypto applications.