I think many, like myself, will concede this point. Harden is a genius at "hacking" basketball. I don't really complain that what Harden does is traveling as much as the traveling rule needs updating so that it is.
What you don’t notice is that the gather step is used for many more movements other than a euro step, but the euro step also has a change of direction and change of acceleration that combine to make the movement look illegal to someone who doesn’t understand the rules.