[Hamuko]

>The biggest downside is that after a power outage, every light turns on.

Set your lights to return to the last state after power recovery.

[soneil]

I prefer to have ours default to on. It means the "dumb switch" (as the grandparent puts it) still works as expected, which is really important for .. everyone else in the house.

(It does make outtage recovery inconvenient, but that's much rarer than the day-to-day inconvenience)