Chart 1: Without outline the chart is easy to read but the opening/closing price of bars that do not have a body can not be determined. If those bars do not have wicks then nothing is displayed.
Chart 2: Adding outline allows all prices to be seen but it is much harder to see patterns.
Chart 3: Changing outline color from White to DarkGray helps a little.
My suggestion:
For Candlestick charts, allow outlining of top and bottom of the candlestick's body without drawing the sides of the outline.
Chart 4 shows how this would appear.
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