I don't think these instructions work since you can't add a shadow to a transparent shape.
My attempt is attached.
I disagree entirely!
Converting a line to a shape (so that you can give it a gradient fill) means it is no longer a line! So what happens if you need to reshape the line? Or change the join style or end caps? Or thicken the line?
None of these are possible without recreating the line from scratch, or keeping a second copy of the line (on a hidden layer) from which to make changes.
As for the inner shadow / glow workaround - this is a multi-step process that involves some sophisticated concepts (such as clipview), where other packages might have a single button to achieve the same effect. Plus the end result is not easily editable, again involving multiple tools and stages.
Neither scenario is a good solution; both are clumsy methods of achieving something that is a frequent requirement in any design / graphics package.
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