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The temptation when assessing the scope of proposed changes is to correct all the known issues (major and minor) in the first iteration. Your thinking may be "I'm going to have spend a lot of time and energy convincing stakeholders to buy into these changes, it makes sense to try and fix everything as part of this project".
Before going down that path however, I advise you to consider the following:
1) Larger more complex projects/changes have more elements for detractors to criticise