Hey interesting chat, and nice bike, i have been riding fixed for the last 19 years . i love it and feel that it makes you a better and even faster rider when you jump on a geared bike.
The is riders out there that can skid stop very well with no brakes, I used to do this but i found it hurts my knees after a bit.
a front brake makes riding faster and safe. if you can’t skid stop by lock your legs on command then you must use a front brake. You may look cool. But not so cool when you go in to the back of a car .
I find spds great on my fixie after years of clips and straps.