Yep, you have to agree with the guy: if you don't understand a tool, it probably will be harder to use. You then might not do as efficient a job, which means the end result most likely will be unsatisfactory. Duh.
Futhermore, if you're not sure what you're doing, your design may be less than optimum. And of course bad design has not impact on performance. Double duh.
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It also has no impact, neither.
Yep, you have to agree with the guy: if you don't understand a tool, it probably will be harder to use. You then might not do as efficient a job, which means the end result most likely will be unsatisfactory. Duh. Futhermore, if you're not sure what you're doing, your design may be less than optimum. And of course bad design has not impact on performance. Double duh.