Luffy right now has the powers of monkey king weapon. Monkey king has a magical pole that could stretch for miles
Monkey King had virtually any power, from controlling the weather to natural super-speed to cloning himself to riding a cloud to many other abilities; is Luffy getting all of that? Because Sun Wukong is like a kid creating their hiper-super-ultra-hero that is stronger than yours. If anything, the pole has been referenced indirectly by rubber stretch because Luffy's character, just like many others (Goku, Zidane, etc.), is a rip-off of Sun Wukong; the issue here is turning a reference into a literal power, which is what I'd find hilariously cheap. My opinion, at least.
Watch out, the usual suspects will try to convince you that Luffy was always supposed to be a mythical-zoan prodigy and that this was all Oda's masterplan from the get-go ...
I hope not. It always amazes me that some fans think of Oda as a genius with a masterplan yet the poor guy consistently comments on huge things being pretty much improvised (whether it's Ace being Roger's son, or choosing Lucci as Water 7 villain, or the Supernovas...).
Totally sure he thought of the Gomu Gomu as what has always been, a rubber fruit. The idea of it being somehow special and more powerful than we assumed literally goes against Oda's own words on why he chose such power for his main character.