oldgit would you explain what you mean when you say engineered? to propel you..
I have had PX SL Pro for a number of years now and have had no issues with mine what so ever and would never say the bike has felt flexy one bit and this bike has been used for everything from Sportives, Triathlons Time trials to my one and only Ironman, personally for the money i don’t think there is a better bike out there!
That said i have never ridden any other road bike of Top quality or Top price but if they can do half as well as the PX then it would be doing good!!