If you stay home with your parents for a year or two, you’d get plenty of savings if you’re careful. I know I did.
I know in more individualistic countries not moving out by 18 or 20s has traditionally been seen as taboo, but the current housing situation makes that traditional social rule very impractical for many. Besides, from what I heard in the USA, still living at home with parents is less stigmatised than before.
Moving out at a young age is only a norm in just a handful of countries, mainly the English speaking ones. Reason being that they were more developed than the rest of the world, making it possible for them to move out when they turn 18. Poverty is a big reason why families are closer and live together for a much longer period. But many of these developed nations seem to be regressing these days, with more money flowing upwards than downwards.
I agree though. The best time to move out is after you’ve worked and saved up enough for a down payment for your own place. Those few years are perhaps the best opportunity to save up that most of us may never get again.