Whilst I'm also not that bothered by all the marketing that gets put out about wheels saving you xx seconds or xx watts...
Surely the whole point is that, yes sure you could make marginal gains elsewhere - but if you've already done all of those things, the wheels will gain you a little extra..
Yup, the wheels could gain you an entire 2 seconds the next time you climb Alp D'Huez. Oh wait, you don;t regularly run intervals up and down Alp D'Huez???
I think what these report reinforce is the reality that the differences are effectively ZERO for all but the absolutely most elite of riders, of which NONE of us qualify. Your time will vary much more based on whether you take a nice morning poo, have a "good hair day" or whether you skip the gloves for the aero advantage.
In the USA everyone is poor and sits around passing laws that benefit millionaires- because some part of them thinks that one day that will be them.
I think this is the same sad phenomenon with hobbyists and these wheels.
I own Lightweights personally, but that is because I like the looks, the stiffness and the ride. I would not have gotten them thinking they make me "faster," I got them because they make me cooler.