Why doesn't BGP... -Reply

Quick comment: You're looking at the computing of routes wrt one router.
I'm suggesting that perhaps we should consider the set of all routers since
we're concerned about spreading load due to the quick communication from
one router to many of every best external-path changing.

Some people are concerned with that and others are concerned with
end-node (or close to it) routers where this is not an issue. I
suspect nanog has a good mix with many who run both types.