Actually it is not this simple.
When you issue currency, you back it by an IOU. If you buy say a land, using that currency, then that land's value is exchanged for that amount of cash. So on and so forth. Now if you take a loan and start the business, your business and its assets are valued in that currency. And they are backing that currency. If you simply write off the loan, you still have the currency issued which is backing the loan but its underlying value is written off and has no value in it.
What you have done is essentially inflated or devalued your currency. If this happens to a big chunk of your economy, you see hyperinflation. There is curerncy but there is nothing to back it.
This is the reason why you cannot just keep on issuing the loans and creating houses etc without ever closing those loans. You will devalue your currency if you do it for long enough. This is why when there was a stock crash back in early 2016 a lot of value was lost and the currency came into pressure. Chinese government had to spend quite a bit from her forex reserve to keep the currency stable.
So, in nutshell, debt is debt and taking it as 'asset' is going to bite you in your back. sooner or later.