Hi-vis SCREAMS to be seen.
I can see hunters' hi-vis clothes from over a mile away across valleys when riding in the woods. They POP out and are almost impossible to miss.
On the road I see riders wearing hi-vis gear without even looking for them. They are 100X more visible than everything else, in heavy traffic, or in the fog, dusk or dawn. I see them even when I'd been daydreaming or was distracted.
Lights are directional. You only notice them if they're facing you. But hi-vis vests & helmets can be seen from all directions.
Being seen improves the odds in your favor. That's a smart thing to do.