I might have taken @mlroseplant out of context too, at least in terms of motivation. I know he tracks his kilometers walking in heels and it is only natural when you do that, to want to increase the number. In that context, when looking at choosing between flats and high heels, it is only natural to see wearing flats as a missed opportunity to increase your overall kilometers in high heels per year. For others... like my wife... shoes are part of the outfit, and having the ability to make it formal, or informal, is part of the fun.
I side with her in some sense on that because as a traditional man that dresses as such, as we talked about on another part of this forum about jazzing up the male wardrobe, I am a bit jealous of her because I think my choices of fashion and footwear are a little lackluster.