You're right, Obama didn't do the "exact same thing." He literally auctioned off the posts, giving the ambassadorships to campaign contributors and bundlers (
https://www.washingtonpost.com/politics/obama-ambassador-nom... ). It's easy to find replacements if you don't care about qualifications and just reward your donor list, I guess. One of the ambassadors was so bad, staffers working for her requested transfers to
Iraq and
Afghanistan -
http://www.politico.com/story/2011/02/report-rips-us-envoy-w...So, yes, some posts may be left without an immediate replacement, but it's not cause for panic if the alternative is immediately filling the posts with unqualified campaign donors.
EDIT: These are undisputed facts in response to a hostile question accusing me of being a paid actor (ridiculous, my account is 8 years old) posting things that would be a "crime" in other countries. People down-voting this should check the irony considering they're upset at the President for censorship.