Ho trovato questo post molto interessante
qui.
The stock Yeti trades bump erasing comfort for faster times, responsiveness. It favors pop off of smaller compressions. It's light footed in a way. A coil improves this. It's the trait of a linear suspension; it's sporty, like a track car. A progressive suspension is heavy footed, sitting deep into travel, popping out of deep compressions like berms and kickers. It's a natural bike-park jumper, erasing braking bumps, but lacks the responsiveness and speed when every second counts; it's like an off-road 4x4 that is expected to see air time. It's a matter of preference. Yeti decided to go the "race-bred" route, but it's not like you can't change it with a different shock. Looking at the kind of trails people ride, how much of it is generally smooth, taking all the fastest lines? If you answer along the lines of "a vast majority of it", then you can see why linear suspension has an application here. I can see someone that seeks a forgiving suspension that can save them from mistakes, opting for progressivity, but under someone that has practiced lines with utmost precision, that progressivity isn't really helping them.
You should run more sag with progressive suspension, and less with linear suspension, to bring out their best traits. It would feel awful trying the opposite. Air springs are becoming more coil-like these days, but with very high pressures that prevent bottom out. If a rider is having trouble utilizing full travel, feeling like they need to run extra sag, which spoils the sporty feel, a coil with less could be the solution. Switching to an old air can (without the extra negative chamber volume), will give the SI suspension more plushness, but it will lack the supple/sensitive feel on small bumps--it becomes more progressive, but ironically, it becomes far easier to bottom out (example of how things are not so simple). A rider might prefer air on a SB6, but coil on a Nomad, but might later find his level of aggressiveness might put him somewhere in between, regarding how much progressivity he likes. Can tune that with spacers on a SB6, but can't really do anything to bring the progressivity down on a Nomad without new link (a longer upper link maybe)? A lot of brands, including Santa Cruz, have flattened out their curves to be more linear on their trail bikes. Bikes designed for jumping are a different story.
It's a huge world out there, with diff terrain and diff levels of rider aggressiveness. Think about this for a moment, an unfit rider going off of a drop at a walking speed vs a pro rider launching off the drop at 15 MPH, both riders weighing the same, which would put more stress on the rear shock upon landing? If you picked the pro, and are certain of it, you're probably delusional. The slower unfit rider is essentially sandwiching the frame between him on the earth and all the gravitational force from the freefall is going to the parts that give most--while the faster pro turned more of it into additional forward momentum (tires take a lot more stress though). If the pro's bottoming out their shock, they're probably riding poorly.
Basically, what you want is not what others want. Why bother stating that their choices are wrong? Started off with an innocent question, why are people going coil. Maybe it's just their preferred level of progressivity, + the typical pros of coil, such as set-and-forget consistent spring rate no matter the temp or how hard you ride. What I've said is just the basics of basics. Want to know how damping plays a role too? Well, get a solid understanding of the basics first, as it builds off of it. Maybe "graduate" from analyzing the leverage curve to the understanding the forces curve (leverage curve + spring rate curve combined) as your next step.
TL;DR: Linear susp is sporty, fast, and efficient. Going fast and being able to readily pop off of small features is fun. Riding well on linear suspension is rewarding. How much progressivity a person might want is personal preference, depending on how much forgiveness, bump erasing, and jump boosting they want. Linear susp brings out your A-game, while progressive susp can give a false sense of security.
