Well there’s a difference between high interest debt and just debt. And agreed don’t get into high interest debt to begin with and pay it off ASAP if you do anyway. But avoiding interest all together is a massive oversimplification and shows you don’t understand that cash in hand (and the ability to earn more from it) can be better than a low interest loan. If you make 10% from cash on hand and have 5% loans then you got free money and 5% gains.