Nokia has few applications under open source licence such as Modest and application manager. Now, as case with Modest by the time of creation of this text, there are a few critical bugs/issues which affect a large amount of people. The fix is available in the source code but updated version of the package is not released until Nokia releases a full update. The lead time could be couple of months and the release times are never annouced beforehand.
Due to the delay, many active people notice the same bugs and go to bugzilla. Sometimes they do notice the existing report and write their own - this causes many duplicated bug reports to appear. Sometimes the bug is already fixed internally. A lot of effort is wasted thereby with the delayed bugfix release and redundant work. Delays and redundant work creates frustration. Additionally, the software may be unusable for many months when it could be fixed now. Talented individual frustrated enough might roll up their own update, but if 10 people do it for themselves this is clearly again a lot more wasted effort and time.
Delay is therefore bad for user experience and can make the whole device look bad in the eye of frustrated people. This is definitely a lost position for marketing efforts when fast bugfix releases would be a positive element for consumer mind.
Discussion on Talk: http://talk.maemo.org/showthread.php?t=35793