Smaller systems are (almost) always better if you donโt like the extra work of the administrator to remove the coding time.
I like the way the Pivotal Tracker separates them, to avoid the confusion you're talking about, and to pay particular attention to the client. User errors are โerrorsโ, internal elements that do not have visible benefits for the client are โjobsโ and are not displayed in many views, because they do not provide client value (there is no reference to the user's history This).
Therefore, I would think that most problematic trackers have ways to break down the types of problems, and I would single out "paying off technical debt" separately from errors.
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