I'm not sure what Soros was talking about with his “unwritten checks and balances” statement.
To my knowledge the term “checks and balances” does not appear in the U.S. Constitution, but the principles are certainly there.
The President can veto a law. The Congress can override a veto. The Supreme Court can strike down a law.
Both judges and presidents can be impeached and removed by Congress.
The president appoints judges and Congress approves the appointments. And so forth and so on - checks and balances.
Yes. You are correct. It has nothing to do with the POTUS consulting on policy directives given to an agency or department, or their day to day operations. People and politicians are free to talk poorly about decisions, that’s America and I like it (prefer it when the speakers are normal brained people) but no, there is no C&B or historic customs requiring consulting with Congress or anyone else on agency level day to day procedures policies. Except maybe the kleptocracy keeps an eye out for one another and asks around who of their fellow travelers will get hurt by such and such decision. Sort of like what Elon Musk said the other day in the Oval Officd behind Trump. “Everything is geared around complain minimization. If everyone gets money nobody complains and everyone wins”.