It makes perfect sense to me. I’m glad my kids live here. They will leave soon enough. They have rooms and can save money. Apartments are insanely expensive. Jobs are few and far between. My brother lived at home til he was probably 25, then he bought a house. There should be no rush toward living far from the family who loves you. Family is important.
If they weren't progressing toward independence, we'd help them make a plan to do so (with boot to the backside as needed), but they seem like they are on track. If we can smooth the path to success, we will.