Spin is often what makes the difference, people who struggle with distance are not imparting enough rotation over the range they want the disc to fly.
A non-rotating disc is not going to fly very far no matter how much speed is imparted into it, a non-rotating object can't really form a consistent trajectory through the air, rotation is what let's something create a consistent trajectory through the air/atmosphere, and the reason golf balls without dimples were replaced with golf balls with dimples, why baseballs have seams, so do footballs, and of course anybody who really knows how to hit a good slapshot in ice hockey knows they must rotate the puck so it CUTS through the air.
And if you are familiar with firearms, the barrels have rifling in them so the bullet will ROTATE.
A hallmark sign of a beginner in disc golf is the flailing disc that hyzers out really quickly, largely from a lack of rotation. The smooth pull that parks under the basket is one that has the requisite amount of rotation dialed in for the shot. Rotation is what lets a disc golf disc get floaty and glide, power pushes it down the line, but power can not push a non rotating object very far in any particular direction. If you can not rotate the disc well, you will struggle in the wind, especially headwinds.
A hallmark sign of an experienced disc golfer is the slow, smooth pull that goes farther than most of the other players out on the course. Yes, there is some acceleration before release, but the rotation is often what makes the difference between 2 players.
In the end, speed and spin matter, but most shots on the course do not require max speed, but imparting the right amount of rotation will always be important, even on putts, and once you get tuned in, you will become less of a fan of push putts and learn to get a little rotation on all putts (unless you really like the sound of those short putts hitting the cage).
A lot of players cheat themselves out of rotation by letting their wrist get too active at release, a new video posted recently of Drew Gibson and he stresses controlling the wrist at release, and I agree with him, you build the energy, it travels down your arm, do not let it leak at the last second wobbling your wrist, let it flow down through your wrist, into your hand, and into the disc.
A good drill for tuning into rotation is to alternate throwing using a power grip with all 4 fingers on the inner rim and then trying with just 3 fingers (do not use the pinky). Interestingly, in Schusterick's latest distance video, he discloses he only uses 3 fingers, BUT the index finger is the one he pulls off the inner rim, not the pinky. It surely works for him, I threw with him a couple years ago and he really has freakish distance, but I recommend trying the drill by alternating 4 fingers and then 3 fingers with no pinky.