To the contrary it is quite moral, very natural and very healthy physically/spiritually all around for all - pr oven fact.
It is also very cost efficient, money saving, especially when so many are not home most of the time anyway.
Interesting the reference to the “bank of mom and dad” also that the author used. Perhaps a slip of the tongue there by the business minded who just sees individuals as sources of revenue, taxes etc. God forbid families think like a unit instead of individuals and pool their resources - can't have that.
I think the “bank of Mom and Dad” comes from the idea that many of these adults are choosing not to contribute or work any kind of job...unless it is their perfect job.
I think that is the difference between what you describe and a good chunk of reality.