Dale.....
Ok, so you are missing the point.
I've studied Colour Management for some years now and written papers on the subject. Of course you can only take my word that I do know what I'm talking about
Colour spaces have the same number of colours but different ranges. JPEG images can only reproduce 16.7M different colours but the range of colours may well be different depending on the colour space. Prophoto, AdobeRGB have a much wider range of colours than sRGB but the have the exact same number of colours in the digital image....same number but different range.
RAW images can deliver more colours because they may use 12 or 14 bits per colour channel but if you convert these to even a 16bit colour mode there will still be a finite number of colours available irrespective of colour space.
Yes one range will have colours the other doesn't but it doesn't actually have more discrete colours.
While its technically possible to divide a colour space into an infinite number of individual colours - (well limited by the wavelengths), digital images have a finite number due to the number of bits used to represent those colours. This doesn't change between colours spaces - only the meaning of the colour represented by the number changes.
The issue is not that different colour spaces may be able to reproduce colours that others can't, but that each space can only produce the same number of discrete colours....16.7M for 8bit images
Here's an analogy for you. Take two pieces of straight wood of different lengths. Make marks at 10 equal points along each piece. Lay the two pieces on some paper on which is printed the spectrum of visible light. Make the two pieces start at the same point.
One piece will cover a wider range of the spectrum than the other. Each mark is the only available colour that can be represented by a number. The 5th mark on each is at a different colour. Its half way along the range of both but represents a different colour. Each piece of wood has the same number of marks but each mark is a different colour except the starting point in this example.
If you want a definitive book on the subject read Bruce Frasers - Real World Colour Management.
Colin