It seems to me that a key aspect of any project's budget depends on a predictable/anticipatable level of productivity for the team's output, without that a manager can't reliably determine how much time/ resource they will need to produce a product of an accept level of quality for sale in a given time frame,
In the real world numerous factors can influence productivity, particularly with creative endeavours, which are more subject to a human fallible element.
Example COVID. People working at home may be considerably less productive because of numerous distractions. In such a scenario something has to give and in this case it seems to be the pack's quality (i.e. that the pack has been release in very buggy state).