Luckily, we don't all have to accept the facts as they are presented by people who can't figure things out for themselves.
There are more factors involved than just color - paper, gum, perforations all come into focus.
So collect what you want and if color shades aren't your thing that is okay. But at least understand what you are talking about before trying to convince others that they are impossible to determine.
I have not accused you of being clueless or insulted you. If you continue down that path, you will find your account here locked and you can find some other forum to participate in.
I stated my opinion because this thread had people trying to ID subtle color by using images. This is not about whether or not someone collects color varieties, folks can collect whatever they desire and I have always supported that.
This is about education. Unlike all the other definitive identification variables you mention (i.e. perforations, paper etc.) colors are 100% subjective. People need to understand things like how humans see colors and how seeing color is a function of ambient light waves reflecting of the surface of a stamp. They need to understand that colors change over time. They need to understand what it actually takes to become proficient even coming close to being to ID subtle stamp colors. And they certainly need to understand the short comings of digital imaging.
For example, this community has a huge issue with people using imaging filters when generating stamp images. At best and probably with good intentions, users will manipulate an image to make it 'match' what they see on THEIR monitor without understanding that everyone else is seeing something else.
We are not talking about being able to tell the difference between two hues like 'blue' and 'ultramarine', we have endless threads where folks are posting very subtle color deltas. There are also endless numbers of used stamps being shown, often with very obvious paper toning on one stamp, and people are trying to ID very tiny color differences.
So please feel free to help with educating folks on; the complexities of subjective sensory perceptions, the importance of ambient lighting, the importance of developing a large reference collection, how to develop a good color eye, how to account for the aging of the paper and inks, and how to post all the digital imaging details needed to avoid misleading everyone with filtered and compressed images.