They don’t need to work as they get huge unemployment money.
Saudi Arabia is a welfare state trying to avoid collapse, because it has too many people collecting and not enough producing.
Letting women drive and having foreign drivers go home results in less money paid to foreigners that goes abroad, and it may lead to more women working.
The hard part is getting more men to work instead of foreign laborers.
Half the reason they were building mosques abroad was to export a lot of their religious studies graduates, a group that is a large minority of their graduates.