What kinds of modifications tend to be easy to do and what others tend to be difficult to do with packaged software?

What kinds of modifications tend to be easy to do and what others tend to be difficult to do with packaged software?

What kinds of modifications tend to be easy to do and what others tend to be difficult to do with packaged software?
What kinds of modifications tend to be easy to do and what others tend to be difficult to do with packaged software?

 

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