Personally, I hate when people say X should do something. What’s the something? If you don’t know, maybe there isn’t anything that can be done. If you don’t like the options, then why do you want him to act. Politicians aren’t magic, they can’t divine a mystical solution, choices are tough and every option has its drawbacks.

If he’s that dissatisfied with Blinken he can fire him. But if that’s not palatable then he has to stick with him. I assume they talk and Biden has given him direction, so that’s what’s left.

Typically, Parliamentary systems employ a prime minister as the chief executive, so tend to be fundamentally different from the American system.