His sons used to hold feasts in their homes on their birthdays, and they would invite their three sisters to eat and drink with them. 5 When a period of feasting had run its course, Job would make arrangements for them to be purified. Early in the morning he would sacrifice a burnt offering for each of them, thinking, “Perhaps my children have sinned and cursed God in their hearts.” This was Job’s regular custom.

Makes it seem more of a following their birthday feast custom than an everyday habit in context.

A response to feared decadence than a main goal of keeping family safe.