I remember coming across this bit in a review I read. I don’t know if it’s true, but if it is, there’s potential for the Roam to match the Bolt 2:
Interestingly, Wahoo told us that both devices are technically capable of displaying a wider colour palette, but this has been reduced to just 64 colours in favour of an easier-to-read and understand interface. That does also mean there’s some potential scope for future updates here.