It seems you read the entire Katakuri fight where Oda kept explaining what exactly Luffy was doing and all you understood was "LuFfY sEEs THe fUtuRE duhhhhh"
Anyway here are the panels that explain what Luffy is doing. Now read very very VERY Carefully both the panels and what I said about intent and seeing the future and think very very hard
I'm not gonna reply again until you prove you comprehension skills of what's happening are worth my time
He does not close his eyes like in the fight of Katakuri. He sees the Future properly with his eyes open.