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True, although reflectives are good in any context.
One habit I've got into is trying to have 2 lights front and back, not just for redundancy, but because research suggests that the rate of divergence of visual angle between light sources is really useful to road users in judging speed/rate of approach.
As a bit of an aside, hi-vis is a funny one as there's no universal hi-vis - it's entirely contextual. It's based on contrast in brightness & colour (it's probably more complicated than that though).
While it's obvious that most street environments mainly consist of shades of grey (how boring), where fluro yellow works, at some times of day with low sun, it might not be the optimal.
Personally, I don't wear any fluro yellow while riding because every time I'd been in an incident with a driver, it's because they haven't looked, rather than haven't been able to make out that I'm a cyclist in their field of view. I can't do anything about that.