I can see this is hard for you.
If they are unelected, they are unaccountable. The people who grant the consent the to be governed have no say in how they are governed in this hypothetical. If an expert wants to be in a policy-making role they need to be elected by the people. This is why I am against your advocacy of deferring so much to "experts".
You are advocating for an unelected, unaccountable oligarchy where there is no repercussion if they don't pursue the desires and wants of the people they represent. Unilaterally imposing your will on a country because someone somewhere anointed you the expert is not a democracy.