One brake Single-Speed fools

I'm not sure about reducing the 'utility of my bike' - it goes when I pedal it, steers when I move the bars and stops when I apply the brake. Short of losing some fundamental parts of the bike (i.e. wheels/forks/braking mechanism) I'm not sure how else I could reduce it's utility?

I find it quite bizarre comment as well. You ride whatever you get on with.