That's a good point. Deciding to get into breeding isn't the same as deciding to start painting or something because there is a life at stake. The animal needs to be considered in these cases.
Pewters are hard to pass off as a different morph. I personally prefer cinnies to black pastels, but to some it might not matter if a pewter is a cinny pewter or a black pewter in which case I think you can learn about it afterwards.