i do see it as necessary today .back then not so much , but right now yes.
with the byzantine emperor gone , the church in the east is like this.
one can argue for the advantages of ceseropapisim , and that was the best system back there.
as the patriach of Constantinople and the patriarch of Antioch (when the Byzantines recovered the city)
where no saints ,but could never attempt corruption or do scandals on the level of the papacy in political maters like the papacy because if they did the emperor was not going to tolerate it.
the down side is that if said emperor and his empire die , the keeper of stability dies with him .
rigth now if he had a byzantine emperor , the Russian schism would not exist.
speaking of the muslims they are also one of the reasons as to why they are so disunited as they were so isolated from each other that they eventually became there own things or it strengthen past separation .
but rigth now with the papacy having no real political power out side the Vatican and no emperor
(Thank god beacuse giving politcal authority to the papacy made it worried on political matters and gain which lead to the selfishness and the questionable things the church did )
i say yeah , its not in scripture like the Catholics says neither is it found in the early writings , but its necessary so everything does not collapse.