The originally “risky” are being diabolically squeezed
This is placing an excruciating squeeze on the weak and more risky clients of the banks, because even if these are performing much better than the originally “risk-free” banks might choose to liberate capital by getting rid of these exposures without booking losses so as to be able to keep on the books AAAs turned into junk and that if sold would hit the banks harder.
Also let us not forget that the capital requirement for any investment in an AAA rated public instrument is 0%. In all, with their minimum capital requirements for banks based on risk, the regulators have created a monster.