> near as I can tell from the photo there is no obvious bypass. reply

Perhaps across the bridge the photographer is standing on .. ?

Can't see that? Nor can I.

Point being it's such a tight shot there could be any number of alternative routes, jumping across the stones needn't be the only path.

I am 99% certain there is a walkway there. There are plenty of absolutely inaccessible places in the Tokyo metropolitan area, but Tokyo Disneyland has a pretty flat/maintained walkway to give access to the whole park as the primary way of moving around IIRC

Building all public spaces for the least common denominator turns all of society into Harrison Bergeron.

Nonsense.

Wheelchair access from the get go and such niceties doesn't lead to ad absurdum leg breaking of the able.