Why increase the cognitive workload to login with MFA?
It's already:
Type in password expecting a smooth login > Process that the new empty text box means you have to check your MFA source > Realise you have to find your phone > Find the authenticator app > Look through the (mine is long) list of registered accounts > If there are duplicates (e.g. AWS Account X, AWS Account Y) then select the right one > See if the timer is nearly 0 and if you'd like to risk using the code displayed > Enter code