I think I understand your point, under ideal or almost ideal conditions most webcams can work fine. However, most people are not graced with the understanding

I think I understand your point, under ideal or almost ideal conditions most webcams can work fine. However, most people are not graced with the understanding of lighting and how cameras work. There's lots of opportunity to compensate or at least guide people with better hardware and software. The work done with smartphone cameras is clear evidence of this.