I can appreciate that. I have some perfectionist tendencies myself. I think it is a tricky balance that must we must walk. I like your idea of "as perfect as our constraints allow".
Another important consideration is the level at which the quality exceeds the needs of current and future users of the software. Past this point (which might be impossible to determine or fully agree upon), one must acknowledge they continue to iterate and polish for purely personal reasons. This can be fine in certain situations, but it may be a detriment in professional endeavors.
And of course, like always, one must consider opportunity costs.
Another important consideration is the level at which the quality exceeds the needs of current and future users of the software. Past this point (which might be impossible to determine or fully agree upon), one must acknowledge they continue to iterate and polish for purely personal reasons. This can be fine in certain situations, but it may be a detriment in professional endeavors.
And of course, like always, one must consider opportunity costs.