We only get 3 days a year of sunlight here in deepest, darkest Scotland: I refuse to put my lights on when it's, erm, light!
I also stopped wearing yellow hi-viz once I saw everybody was wearing it: council workers, BT men, wee kids out for a stroll.
I now have a stylish, reflective,
Sam Browne belt that I can put in my panniers and not look like a "cyclist" when at my destination.
Of course cyclists on the path without lights used to annoy me (I don't drive, can't comment as a driver) but I have learned to keep an eye out for them.
Cyclist with over bright, especially flashing, lights in an urban environment think they are safe, but nothing is safe from dozing drivers!
There could be anything unlit on a road, a fox, a cat, another car whose lights have failed, a drunk person crossing oblivious.
Drivers should learn to look out for the unexpected, imo.
Anyway, if the op saw them, they were not invisible.
Why doesn't someone develop stylish black hi vis and make everyone happy?
My black
Altura Night Vision jacket is stylish and had many reflective details, it really stands out in the dark.