while debt might be well marketed as acceptable, I worry that you have allowed yourself to consider it not real: if someone is in debt to the bank for the majority of their homes value of 300k while earning 50k PA and then someone else pays 10k rent PA but earns 40k PA then the person on 40k is still wealthier
Not quite - because the person with the 300k house still owns the house. They have a 300k asset and <300k in debt. (assuming house value didn't crash after they bought it.