IRL, you default, your credit takes a hit are are subject to fines, collections and possibly a court case. Even paid back in full, your credit carries the ding for quite some time.
Now for BTC related defaults. There is no real recourse (except the negatives) to collect the defaulted loan. Yes, it's a good thing to finally get repayment but it was done so on the defaulters terms, not the contractual terms agreed to. Is this what we really want? Defaulters deciding to just pop back up years later (maybe wanting to sell the account or it is hacked) when it suits them and to offer repayment to reinstate their Trust? Kind of like paying a penalty to reinstate an account to good standing, although it falsely shows the account in a positive light. If so, forget the contract between creditor and debtor, just roll the dice and see if they may want to pay not not. Lenders should stop lending because the defaulters now arbitrarily dictate the rules of the contract, changing as it suits them.
As far as any negatives, that should be up to the one that left it and the future (although now very suspect) actions of the defaulter.