One thing which apparently can't be done with Darcs, Git or Mercurial is 
managing multiple repositories at once.

For example, consider Glasgow Haskell Compiler, which is written in 
Haskell itself. The compiler, interpreter and run-time system are one 
repo, and the various standard libraries it requires are independent 
projects with their own repos, but GHC mirrors a copy of each, lagging 
behind the upstream slightly. The main GHC repo contains a special Bash 
script to do things like update all the sub-repos automatically. The 
existence of this script tells you that there's functionality that Darcs 
itself is failing to provide. (And Git and Mercurial, apparently.)

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