Office of Advocate missing
Agree with your critique and observations, but would like to add, that EVERY admin SHOULD be an advocate
Sorry, but there is no SHOULD can be. Everybody has specific skills and inclinations. (Not to say wikipedians are volunteers) Some people just hate to babysit, but this does not make them bad admins. The position that wikipedians must have a reasonable "degree of adulthood" and be ready to answer for themselves is valid. But some are willing to help others to reach this "degree", while others have skills only to assess it.
On the other hand, your statement may be read as "EVERY admin SHOULD possess traits you listed for an advocate". Then I cannot help but agree. And even more: "EVERY wikipedian SHOULD possess traits you listed for an advocate". But this is but an unreachable ideal.