The introduction of randomness allows a nice fluctuation that averages out to a known quantity over time.

The only real *daily* habit is flipping a coin and rolling dice. Everything else can be tweaked, scaled up or down as wanted.

As I decrease my deficit, for instance, heads will likely become TDEE+15%, tails TDEE-15%, a multiplier of 25 on kettlebell, etc. Same daily habit, but modified in a small way.