Re: The real issue
"You should have seen the DC Managers face when we met the other guy where both sets of fibre went through the same conduit out of the building!"
The best I've encountered in my 40-odd years telco career is full diversity - via different wavelengths on the same fibre pair.
The "geographically diverse servers" for another project were not quite what we had in mind when the request was made either - different racks, side by side, in the same data centre. For a later iteration of the system that was changed - the racks were at least no longer in the same row!