I figured I would finally register and make a post about this because I'm super confused as to why so many people are calling for the ban of the Nike Dragonfly or invalidating or detracting from performances just because they were run in the so-called "super" spikes. Is there some research that I'm missing out there saying that the Dragonfly provides anything close to the 4% boost in economy provided by the Vapor/Alphafly? While they're clearly better than previous models of track spikes, I just see no reasonable argument for banning them or putting an asterisk next to records set in them, or discounting marks just because they were run in Dragonflies.
While I can certainly see the argument for calling into question or putting asterisks next to marks run in road supershoes (as they're a new frontier of footwear that provides a tested and reproducible 4%+ boost to running economy), I don't think it makes any sense to do so for the Dragonfly. They follow the same design principles that track spikes have for forever, and only improve upon it by adding a better foam and a few millimetres of stack height.
They use a traditional Pebax plate which has been in use for years without issue, and the shoes do not have the sufficient stack height or the rigidity required in order to produce the same rolling effect as the plated road super shoes (the road shoes mainly work by combining the trademark superfoam bounce and energy return and stopping the MTP joints from bending (as they do not return any energy when flexed, unlike the arch of the foot and the ankle). In order to reap the benefit, there has to be a specific shape to the plate allowing for a footstrike and a roll off the toes, which isn't present in the Dragonfly. A flat plate only transfers the load from the toes to the ankle, negating any benefit. While they accommodate a heel or midfoot strike, due to the angle of the plate but lack of stack height the Dragonfly clearly reward an aggressive forefoot strike that is not required to enjoy the benefit provided by the plated road shoes.
Coming back to my main point, they are, in effect, the same track spikes that we've been using for years with a key difference, the type of foam. Which brings us to my main point: how can anyone justify a ban of the Dragonfly or discrimination/prejudice against marks set in them, on only the basis of them having a superior foam to the EVA fare that has dominated track spikes for years? We've seen softer, higher stack height spikes before with the Avanti Boost, if fast times began to be set in them would people be calling for the same bans/asterisks? By that logic, would we be clamoring against EVA spikes if say, solid rubber or polyurethane was industry standard?
Assuming the foam and only the foam is the problem, are runs done or times set in the Pegasus Turbo line or ZoomX Invincible inferior or invalid? What about the Reebok line of Pebax foam shoes? What's the logic behind an arbitrary rule or ban against a specific shoe that follows all rules and has only upgraded one component of the design and has otherwise followed all the traditional design principles?
What about a ban on Pebax foam? What's the reasoning? How do we determine which foams are "too good" and foams that are "acceptable"? Unless I'm mistaken, there's no research suggesting that the super spikes provide a boost approaching that of the road supershoes, so where's the fire? Are people just jealous that they didn't have access to the shoes when they were in their prime? Do they just not understand how the shoes work? Are they under the impression that they provide a flat 4% reduction in times, when in reality the 4% stands for a 4% boost to economy, which likely has a much smaller benefit than in the 10,000 or marathon than over shorter distances like the 1500-3000 (distances in which I've seen marks be highly criticized/invalidated by people, not to mention that the spikes have not been shown to provide such a boost).
Are people just in denial? Am I just dumb and missing something important about the spikes? What's the deal? I realize that this may come off as ranty or like I'm obsessed with shoes (I am), but I really hate to see people's hard work and race performances come under fire and be invalid in the eyes of the public just because they decided to wear a certain pair of shoes.