I agree with much that has been said, and in IMHO, as long as people can (legally) support themselves, and are living the lives of their dreams–why judge?
If, however, people expect others to support them, for whatever reason, and for an indefinite period of time–that’s an entirely different issue.
I should add that since I have grown children, I’ve seen both sides of this scenario. Thankfully, our kids have managed to support themselves for the most part, but at least 50% of their friends–all well-educated as ours are–are still almost completely dependent upon their parents–with no real end date in sight.
I should probably also add that, although our kids know they will be receiving very nice inheritances, they also know that we expected them to learn how to support themselves in life.