[bravo22]

That wouldn't be a store of value in the sense of actual purchasing power because you're tied to the inflationary effect of that currency.

If you mean an account that holds its absolute dollar value, you are right, although T-bills would do the same thing if traded at sufficient frequency. You are also correct about it causing bank issues. The fed reverse-repo facility, which is essentially what you're describing here but for banks to use partially contributed to this mess.

Overall there is no getting away from the fact that "value" of assets is related to the interest rate of the currency and if the interest rate rises some of those will be worth less which means a slice of people in the economy will have less than they did before. The Fed can't do anything to magic it away.

In a similar vein you can't put all your data on a server somewhere, call it the cloud, and cry foul if you lose your most important source code and IP when the server goes down. Banks can't change underlying economics. It was incumbant on the businesses working w/ SVB to not use them as their treasury anymore than they would put all their code on one AWS server and call it a day.