Good question about the "With whom?" Our embassies, need the little people who process paperwork, visa applications, help deal with US law on imports/exports stc.
For policy, the ambassador a position that was created to speak on behalf of the president, aren't we better off with nobody than the existing people who are #neverTrump? In our current world where Millions of messages go around the world, we can have securely ecrypted point to point, face to face meetings between heads of state. We do need to develop the talent of people who can deal with international relations etc, but if we have traitors in place aren't we better without them.
It's a good thought, actually. I'm sure Tillerson is still getting his feet under him at State and how to finally figure out just what the heck the Russians are trying to accomplish while slowly giving up his illusions about how the world actually works versus how he thought he did.
I'm sure dealing with Lavrov has been a sincere education for Rex. Let's keep our ears to the ground for changes at various embassies.