I'm not sure you learned the lessons. Other than MBS being coincidentally involved, this has literally nothing to do with 2008.
The MBS wasn't even the problem here. If they had 10Y corporate bonds or Treasury notes paying the same rate, they would have had the same problem.
A bubble 15 years ago? We're in a massive housing price increase bubble now.
Buying $80bn of MBS in the middle of a well-known housing price bubble is catastrophically stupid.
I think heavy exposure to a single type of long-term asset for a retail bank is always going to be a bad investment decisions, because risks materialize, and correlated risks tend to materialize together, and when a retail bank suddenly lacks liquidity...
In 2008 MBSes were bad because the underlying value of the investment turned out to be bad. That's not happening this time. All that's happening is the same thing that happens to any bonds -- when rates increase, older lower-rate bonds lose value because why would anyone pay full price for them when they can get a new one with a higher rate?
This situation today has nothing to do with the failure of the MBS'S to payout like 08.
Do we now have people making decisions on stuff like this who are too young or clueless to remember what happened with the 2004-2007 mortgage backed security bubble that popped in the 2008-2009 financial crisis? Seriously? Did nobody learn the lessons on this? Countrywide and other originators of MBS and CDOs?