I don't know if it is healthy to tell young adults to feel shame for using help their family is willing to give. esp, when if doesn't use up many resources. why do you think staying with your parents, and letting them support you financially, automatically means you are a burden?
Supporting an extra adult in the household is not a zero-cost venture. It's about $300-$400 per month if you feed them. I'm basing this on several years of experience renting out individual rooms in my home. I can break the expense down if you like, but your list missed several key items including auto insurance, food, toiletries, and the difference between an individual and family plan for services such as phone lines, Netflix, and other things you may want to use. Including an extra person in treats such as family vacations, an occasional restaurant meal, or similar small luxuries can and will add up.
Also, every extra adult in a house creates about an hour a day in extra labor related to cleaning, cooking, laundry, garbage removal, etc.
If the extra person does no more than clean up after himself or herself, he or she is still a financial burden. If they refuse to clean up after himself or herself, they generate an hour a day of work for somebody else. That labor has to come from somewhere, just like the money to pay for the extra food or utilities has to come from somewhere.
There are people who can and do pull their own weight in a household by chipping in for groceries or other expenses, doing chores that go beyond what it takes to clean up after them, and making themselves useful. During this time they are generally pursuing an education, saving money, and strengthening their position. People like that are also generally welcomed because they're an asset to the household instead of a liability, and few people on this board blame or shame them for that.
The people on this board who speak up in favor of sharing accommodations with relatives have four things in common.
(1) The person who moves in provides a valuable or useful service to the homeowner
(2) The person who moves in covers at least some of the expenses associated with keeping them (such as their own groceries) or else provides labor in lieu of payment
(3) The person who moves in behaves with basic consideration, courtesy, and regard for the owner and cares whether or not he or she is getting a fair break, and
(4) The person who moves in is behaving in a financially responsible way, saving money for the future or perhaps doing necessary education, business travel, or other things that position him or her better long-term and not simply seeking to use the owner as an enabler to provide the necessities while their own income finances a spendypants lifestyle.
If any one of those things are missing the arrangement won't work out.
The stigma against young adults living with their parents comes from the fact that most people who do it are
not meeting one or more of those conditions. Too many of them aren't providing enough up-side to justify the resources they consume (point 1) or covering the expenses they are capable of covering (point 2). Why? Because they don't see why they should go out of their way to do what they can to help the people who are helping them, instead of just using those individuals for all they can get (point 3). Meanwhile, since someone else has been duped into paying the bills, they aren't acting like competent stewards of what resources they do have (point 4).