This might be unique to each parent as well. Some children do require extra attention and it is very difficult to managed work time in.
With most schools letting kids out around 3pm it's not easy to keep the children occupied before the work day is finished. This leaves parents either on a work call with kids heard in the background or working late at night al week.
Think of it as if the person is a caretaker and a full time employee at your company. It's basically two full times just that happen to overlap during the day.
I think calling it a privilege is really unfair but if the people are missing work and not meeting deadlines then management needs to step in and work out a solution. Work life balance is hard.
I blame the streaming boom and then password sharing crackdowns.