> Users of Debian packages should be encouraged to file bug reports with the > BTS directly unless they can be absolutely sure it is an upstream bug. How > many of those users have the time and expertise to read/grep thousands of > lines of source code and make such a decision?
No, all bugs should be reported to Debian (with the exception of a few very actively developed - alpha/beta quality packages like mozilla). The maintainer often knows the package better than the user, and it can make a better bug report, often summarizing many user reports he has received.

