Here is a view from a former Custom Painter that spent more than 2 decades talking to people about colors. People have so many ideas about what they are trying to achieve through colors. And there are just as many answers to the numerous end games envisioned.
Let’s move closer to the present to avoid my usual wall of text Thesis.
During my painting career, I painted many things that ended up black😳.
When I started modding yoyos in 1998, black was what I looked for. I just thought that was the thing.
Then… I started going to Contests, here and there. I immediately noticed something. A number of the players wore black shirts. And about half of them used black or darker yoyos.
Without good contrast, it was actually pretty difficult to ‘see’ what was going on. Obviously that was/is my opinion from a viewers standpoint.
I thought about that for a while. Then I just mothballed my thoughts.
As I started throwing more, I easily realized that certain lighting conditions and background colors presented various degrees of difficulty in seeing the yoyo in motion.
From a functional point of view, I personally feel that brighter colors are much easier to ‘see’ under a wider number of backgrounds. Easier for me to see. Easier for others to follow when viewing.
Over time as vision powers fade, the majority of yoyos that aren’t black or dark; are just much easier to follow in motion.
… if in a unbelievable dream, I was actually good enough to compete or produce instructional Yoyo trick videos. Black would be my very last place choice.
Black yoyos look sweet. But for most situations, most yoyos lighter and/or brighter than black, will be more useful.