Could you add an example of a situation where you would see an indicator light on the bottom of the bike but you wouldn't see a whole arm?
Also most cyclists I see love wearing dark clothing, especially in winter, at night, without any form of adequate lighting!
Just because you object to my anecdote, don't reject it as anti-cyclist rhetoric
No lights either, but a helmet.
I fail to see what kind of uptake a flashing orange light on someone's wrist or bike would help if most folk who use them do not even carry a spare set of batteries for their bike.
The serious cyclists do make themselves very visible and are a pleasure to see alas they number one in ten or so :-(