It literally has to be compromised to work. If the roulette machinery was perfect, you would be able to predict the outcome with Newtonian physics at the start

It literally has to be compromised to work. If the roulette machinery was perfect, you would be able to predict the outcome with Newtonian physics at the start of the spin. It has to have irregularities and asymmetries to trigger chaotic behaviour – and those same irregularities and asymmetries make the outcome biased!