No, you explained why it's convenient, not why it's necessary. It's only necessary for the banking class to siphon off the fat of the land.
Debt is slavery...
"The rich rule over the poor, and the borrower is slave to the lender." - Proverbs 22:7
There are a very large amount of verses condemning / regulating / limiting debt in the Bible; old and new testaments.
First, the greatest source of debt aren't banks, but trade credit between businesses. So banks aren't ones "siphoning fat of land".
Secondly, they do have very important societal function. They do allow massing of capital which can they be deployed for productive purposess like building new factories and investing in equipment. Otherwise, your limits would be limit of your own productivity, instead of productivity of whole society.
Additionally, banks do provide income stream for savers. Not everyone is willing to risk his saving in business venture for part of profit. Interest rate income stream is much safer.
So nice from you to qoute Proverbs 22:7. All my comments here are in awareness of this verse.
Persistence of debt throught history proves it is useful tool for improving one's life. Otherwise, it would be replaced with something better. Debt itself is Lindy. But, it is very dangerous tool which is reason why warnings exist.
Unequal relationships between people are good by itself. For relationship to persist both side have to benefit. And never in Bible is servitude described as something evil.
What is stupid is to get yourself in unequal relationship as weaker side where you can't extract yourself easily. And debt, used stupidly, will put you in above situation. Key words: "Used stupidly". If every debt usage make you economic slave (losing your freedom of action) it would never be used.
What you guys haven't noticed is that verse is written from perspective of debtor. Looking from perspective of lender, message is: "Being lender is awesome, you get to rule people without kingly duties".
And, please, pay more attention where this verse is written. It's in book of Proverbs. Proverbs aren't universal rules to be obeyed blindy. You should first use your brain to determine is proverb's application good idea or not.