MIG wrote:

Now that drivers have been instructed to treat all stops as request
stops, why doesn't TfL make them all red to save confusion?

Maybe they will. It'd take a long time to replace them all...

Back to the other point about multiple routes, surely it's on a
multiple-routes stop that it's most important that buses stop anyway,
as it otherwise leads to the British stupidity where buses drive
directly behind other buses approaching busy stops so you have to be
very quick to signal the right one. For that reason I'd support making
all such bus stops compulsory stops - that, or split them out.

Neil