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I wouldn’t say skill issue, more of time issue. You only get a week to implement something. Quicker to use existing libraries than try to optimise yourself.
It’s both, and they are in a sense the same.
Cheaper less skilled or less experienced programmers take longer to get similar results. One week with a a skilled programmer is a lot more value than one week with an unskilled programmer.
Even more if you want to invest some of that experienced programmer time to get the new guy up to speed.