Shooting heads aside,,,, the key to maximum distance (and accuracy too) is the ability to carry a long line outside the tip. ( Some "tournament" fly lines have 75 foot heads.) All fly rods at some point will "collapse" if you try to carry too much weight outside the tip. many rods today can handle a range of 3 - 4 line weights. So all other things being equal, a lighter (thinner) line will allow the caster to carry more line outside the tip than a heavier line.
Distance casting and casting into the wind are not the same thing,,, but if have the mechanics (double haul, stroke length and timing) to go the distance, you will be able to punch flylines into the wind much easier.
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