I suspect it's mostly "because it occured to me I could," which I think should always be an acceptable reason for building something slightly unusual.
I do rather like the idea of play via stateless link passing, though, and honestly the "prettiness" of animations and interactivity does not, at least to me, seem like a net advantage.
"the right technologies" is highly dependent on the user experience you're trying to achieve; in this case I think I'd argue that for the goal at hand, these -were- the right technologies, just like for the UX goals of more featureful sites a different bundle of technologies were the right thing too.
I do rather like the idea of play via stateless link passing, though, and honestly the "prettiness" of animations and interactivity does not, at least to me, seem like a net advantage.
"the right technologies" is highly dependent on the user experience you're trying to achieve; in this case I think I'd argue that for the goal at hand, these -were- the right technologies, just like for the UX goals of more featureful sites a different bundle of technologies were the right thing too.