(5 hours ago)Storx wrote imo it should be banned. A route number should go from A - B.
Not A - B, or A - C or A - D or A - E.
Similar discussion for variants which should be variants, so no letters unless it's A to B via C or A - B via D, again not A - B, A - C, A - D
It's just confusing for the sake of it.
It works without issue for trentbarton, First Cymru and Southern Vectis…