[Pkg-exim4-users] minor comment on exim README.Debian

[Faheem Mitha]

The README.Debian says

Benefits of the split configuration approach:
    * it means less work for you when upgrading. If we shipped one big file
      and modified for example the Maildir transport in a new version you
      won't have to do manual conffile merging unless you had changed
      exactly _this_ transport.
    * It allows other packages (e.g. sa-exim) to modify exim's
      configuration by shipping files in /etc/exim4/conf.d.

Benefits of the unsplit configuration approach:
    * It is more fragile. If I add optionfoo=bar to the Debian setup of
      a later version, and you have already set this option in a local
      file, exim will break with the new version until you manually
      correct this.

I think the latter paragraph is a little unclear. How is it a benefit that 
the unsplit configuration is more fragile? Is it talking about the split 
configuration here?

                                                                Faheem.