In my years as learning how to be an artist I've gotten really frustrated about how colour and light theory is taught. There is a ton of misinformation, contradictions, false correlations and outright disasters being taught.
I don't want to call out the dumb stuff here but one thing that i have realized over the years that the first step to fixing these things is to improve our terminology as artists, and so I have some suggestions about how we could actually improve the situation.
Suggestion 1: Lets split out colour theory from light physics.
The biggest thing that I see students struggle with is people mixing up the difference between colour theory and light theory.
Colour theory with how I define it. is a bunch of ideas that have been constructed by man to try and systematize how we see and feel about colour. It all exists in our head and to be truly understood you need to think of it as such.
Light physics on the other hand is just how electromagnetic waves work, it is simple physics and so much of it is mathematically elegant.
Now where it gets messy is deciding where we make the split, but my suggestion is that the term light physics should basically as far as you need to go to make a 3d renderer, whereas colour theory should touch anything to do with designing nice colour schemes, and terms such as colour harmonies.
Now an extra thing I would split out is paint chemistry, which is something that still messes with a lot of people. It doesn't relate at all to digital art, but then there is websites like http://realcolorwheel.com/
which mix all three of these things into a messy hard to understand blob.
Suggestion 2: Lets make the colour terms consistent.
Blue is used to describe too many colours, we have exact names for colours, we should actually teach them. This website provides arguments and the correct examples for colours and what they should be names and taught.
Suggestion 3: Stop teaching RYB as primary colours for traditional paint.
RGB is the light primary colours, CMY is your primaries when it is in traditional pigment image creation.
The problem is so bad that most crayon packs and poster paint packs lack magenta and cyan colours, and if they have cyan it's called cerulean blue.
This is the reason why all your colours were muddy when you were painting in primary school.
EDIT: Dammit it, misspelled terminology in the title.