The charts in my Dogwood Blossoms Sweater kit are all just colors. I haven't done any other colorwork, so I don't know if that is true for all kits. In this pattern, it is hard to distinguish some of the colors.
Yes, that's something I never thought of. Is it a KP pattern? You should write the designer/publisher and make them aware that you and very possibly other knitters are colorblind too. Now that there is knitting chart software there is no excuse for not putting symbols in a pattern chart.
I am used to symbols as I used to cross stitch a lot and these charts usualy are either symbol based or have both. I will email and make this point if others are finding it difficult to follow the patterns too.
I'm not color blind, but I prefer the symbols, too. I need a lot of light to tell the difference between some shades of colors that are really close. My Ott Lite helps, but it's so much easier to keep balls of yarn with their labels and then put the symbol on the labels!