I assume those change-up lights are designed for maximum economy and minimum pollution, mimsing on a level or downhill road. If you want to go faster or are travelling uphill they don't apply.
I would imagine too that a lot of cars with six-speed gearboxes won't reach their maximum speed in top gear except down a long hill.
Of course no actual driver would need the damn annoying things for any of these reasons. They are for mainstream helpless car users.
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