> actuality all roulette tables have imperfections such that certain numbers almost always get hit more than others; even certain colors, under extraordinary circumstances

Seems unlikely these imperfections are enough to shift it significantly from 1/38, based on both the variation in the geometry of roulette tables that's small enough to be non-obvious being tiny in comparison with the variation in croupier action, and the likelihood of casinos noticing any very long run deviation in the size of their edge (which is contingent upon customers hitting the zero pocket(s) with a certain frequency)