I live in Tokyo, and only drive in the city center. 90% of me having a light is the legal requirement of having so, I virtually never need it since the streets I usually ride are well-lit. The remainder 10% is that I like the solid feel of the bike overall and felt sad for the integrated light not to work TBH.
Can't emphasise that enough. Especially if you're into black clothing and have a black bike.
"This showed that for cars DRL reduces the number of daytime injury crashes by 3-12%. The effect on fatal crashes can be estimated as somewhat greater (-15%)."
