On Fri, 9 Apr 2021 11:37:02 -0000 (UTC)
Anna Noyd-Dryver wrote:
It needs a handful of extra unbranded spare vehicles across a fleet, which
was obviously considered and costed when the first few companies began to
introduce it. It's obviously seen as a worthwhile expenditure for the
increased visual recognition of the buses and routes, not just among
passengers but among potential passengers, including those who don't
realise they're potential passengers yet.

I can't imagine too many people see a bus and think "Ooh, nice branding, I
must travel on it sometime!". Though I will grant you if its one of the ones
that has the route map down the side there may be some people who didn't
realise where it went and may use it in future.