hate to be pedantic, but while it's a beautiful post, it's not pedantic, it points out how these highway numbering decisions will negatively affect people, congestion, and traffic flow, which were why the numbering scheme was created in the first place.
The author asserts that these decisions will have a negative impact, but one may disagree with that assertion -- and as it turns out, I think they're wrong.
Even the cases of B roads inheriting the number of the A roads they replaced makes as much (if not more) sense as a motorway inheriting that number. Knowing that a road used to be the main road before the bypass was built is useful information!
Around East Lothian, where I'm based, old alignments of the A1 are still A roads: the A199 and A198.