>The straightforward explanation is that random perturbations early in the evolution of life broke symmetry and led to homochirality of all descendent life, similar to how random perturbations early in the life of the universe broke symmetry and led to our world being made of particles instead of antiparticles.

Straightforward (and plausible) are not the same as true. Random perturbations are a parsimonious explanation, but a deeply unsatisfying one. With respect to matter vs antimatter, my understanding is that this remains an open research question in physics.