That being said, in household use the per-household balancing between the phases is usually very poor (e.g. all lightning on one phase). Overall the balancing turns out ok across the grid, but the meter doesn't see that. So this is a very relevant condition for household meters.
Even in apartment buildings, each apartment has its own meter, almost always single phase.
Also, most overhead transformers I have seen are entirely single phase. Often you will see a bank of 3 single-phase transformers if a customer requires 3 phase service. Larger customers are connected to a pad-mounted 3-phase transformer connected to the primary overhead service through an underground dip from the pole.
In the US most homes are just tapped to 1 phase, if there are 3 on the pole.