Retroreflective stuff is equally important - I've covered my bike, bag and helmet in bits of this: https://www.lomo.co.uk/acatalog/marine-retro-reflective-tape.html#SID=82
Electric scooters are *supposed* to be limited to 15.5mph and weigh about 15kg.
Motor scooters are limited at 30mph and weigh about 100kg.
That's a significant difference in the potential energy transfer in a collision.
I've seen that happen to a woman on Tower Bridge, in traffic at about 20 mph - I was cycling next to her. Arse over tit and a bit bruised, but luckily not hit by a vehicle.