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1) The high cost for licensing 
2) The complexity involved - config-specs is a language in itself.
3) Difficulty in training employees to understand and use it properly.
4) Interoperability issues between remote sites.

1) Had an extensive API
2) Had build auditing
...
7) Had the ability to do renames and merges at a very granular level, 
+while also retaining historical info.
8) Provided granular access privileges to parts of the system (some th
+ings must be secret - think gov't work)
9) Changes can be applied/reverted/rolled-back in a single transaction
+ (atomicity) if desired.