In my opinion not at all. FRTB (IMA framework) is very complex and expensive to implement, maintain and run. The market risk capital on average might amount between 3 to 5% of total Capital. This is a low percentage to go for such a complex infrastructure and to achieve a non-significant potential cost saving from Capital Charges V/S SA FRTB (in % term).
I would appreciate feedback from banks/practitioners that implemented the IMA FRTB framework and what is their experience in achieving the desired outcome: Considerable saving of Market Risk Capital Charges V/S the SA framework.