Maybe, but I think another part of it is just a dangerously broad construal of the whole concept of executive power. Executive means you execute. Someone else

Maybe, but I think another part of it is just a dangerously broad construal of the whole concept of executive power. Executive means you execute. Someone else should decide. Executive authority just means you are authorized to do what someone else said should be done. We have gone down a weird road in the US with the creation of "quasi-legislative" agencies that are created by Congress but are then under the control of the president although their function is essentially legislative. Instead Congress should just be able to entirely specify every aspect of those bodies' operations, including what (if any) the president's role is. In other words, the president can "use" executive authority, but the legislature should be in charge of deciding what counts as executive authority in the first place. If congress wants to delegate power to arbitrary bodies with no presidential involvement, they should be able to do so by passing a law as usual. You can of course say that a reckless executive (like the one we have now) would still run amok, but I think we'd have less of a problem if these matters had been clarified long ago.