IMHO it should just be adjustable with a slider. People have different preferences, monitors, office lighting conditions and visual acuity. There’s really no one size fits all in this case.
Making the mesh thicker in edge mode should also not be a thing by default. It’s icky. I want my wires always consistent. I understand it was meant to visually distinguish edge mode from face mode, but it’s not needed when you turn on face dots.