So the difference between STR vs DEX, as STR you will have way more physical attack, critical attack damage, over accuracy which isn't an issue, critical rate which can be improved with gems & evasion which is improved by Swift Step once again isn't an issue because if you can kite effectively you won't be getting hit by physical attacks anyway & you can't mitigate magic attacks.
DEX will come ahead late game 250+ by only a slight amount, as the build is aimed at beginners and not min/maxing then it won't matter late game you will still be incredibly effective!