Yes, Chris, but let me give you an example of when "via points" might
be very useful:

Someone in Fulham wanting to get to Hammersmith Broadway might find it
ueful to know that both the 295 and 391 go via Hammersmith Broadway
when waiting for a bus at, say Fulham Broadway, albeit they use
different roads to get there. If there are no "via points" displayed,
then someone who is told to get the 295 to Hammersmith would let the
391 go past, since there is no way for that person (admittedly, unless
they are standing at the bus stop for long enough to read the panels)
to know that this bus will pass there.

Chris, in the example you give, of course Edgware Road is a very long
road and having that as a "via point" would not be particularly
helpful. Marble Arch being a single point is, however, a good point to
display, as would any road junction or station name.

Marc.