A Charge Time change (either increase or decrease) isn't objectively "good" or "bad" because it implies a proportional change in Impact.
> An increase in Charge Time will result in an increase in Impact
> A decrease in Charge Time will result in a decrease in Impact.
Faster and Weaker being "better" than Slower and Stronger is arbitrary.
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There is no change to the impact value bar when changes to draw/charge time are made.