You have a good point, parents duty never stops even if their children have already their ways of living and can earn their own money. That's the unstoppable and unconditional love of parents. It's a forever commitment to their children and they are not asking for anything in return for the love and support they give to them. Whether it's with financial support or just a support system that they need. What you have said is right in all levels that parents will never stop loving their kids and they look at their grown up kids as the same as when they're younger.
Nothing changes, just that some parents find it hard to foot bills afterwards when their child's demands begins to outweigh their source of income, that's the only time some guardians start to push down full responsibility to their adult kids, yet that's for such parents. Bouyoant parents barely give up at funding their children, regardless of the age, especially those who run family businesses.