topological closeness....

Well, i simply pointed out that solution based on
*hosts* choosing the best paths in global networks
is not going to work. It is in the same category as
source-based routing.

Actually, people do both and it seems to work well enough.

Some web servers track throughput to sites and redirect users to
mirror sites based on that data.

Some routers route based on source address (for various policy reasons,
including load).