I seem to completely misunderstand the dynamic.
As I see it, you have paid $700k for the house with the bank’s money (in this thread there is no deposit), bought back some of the house from the bank with $50k of your own money and then lost the house so you’re out $50k with no house.
If the bank does pay out some of the value of the house to you based on equity, it’s just going to be a smaller amount than $50k since the value of the house is lower and part of your repayment went to interest so you don’t even get $50k worth of equity. This feels like a worse position to me.
Like the bank has lost money for sure, but we are not getting that are we?





Like in that famous idiom, you can lead a horse to radioactive pellets, but you can’t make it eat.