In practice most people aren't going to have multiple Macbooks, and if that's you you should go to Monoprice and just get different color cables for different types.
I don't think I'm an outlier. I have a late 2013 Macbook Pro issued from my employer. I also have a personal Macbook Pro. My wife has a new Macbook. I also have an old 2012 Macbook Air. So between two people there are 4 apple computers in a single household. Add in 2 iPads, 2 iPhones, and an Apple watch and this whole adapter situation starts to become a major issue.
