No contradiction at all. If someone wants to buy a crankset/BB that tests stiffer or is advertised as stiffer, that's great. The physical need, though, is not there because it's exceedingly likely that any power lost to flexing cranks and/or BB axles is beyond the ability of a human to discretely detect, especially then that power loss is accompanied by an also very small power loss in frame flex, wheel flex, and on and on and on. In fact, it's yet to have been shown by anyone that the hysteresis resulting from crank flex has a detrimental effect on bicycle performance or human performance on a bicycle. You should read that again: there have been zero tests that show crank flex to adversely affect human performance on a bicycle. Now, if you'd like to address that on a technical level, have at it.
It is entirely possible that someone might "feel" like they need a stiffer crank, stiffer frame, or whatever: that is a personal judgement and partially a result of that person's bias. It is not in anyway indicative of a mechanical performance issue with the bike. The human sensor is a wildly inaccurate sensor that is easily biased by emotions and preconceptions. Here's a simple example that might be almost easy for you to understand: Mavic (uhm, they make wheels. I didn't know if that was within your scope of knowledge) did a study and found that the riders in their test group could not reliably say whether the wheels they were riding were "stiff" or not. Mavic had the riders ride wheels that were laterally very stiff or laterally noodly, but the riders could not determine what they were on with any success that implied they could detect the differences. So, what does that say about people who feel they need "stiffer" wheels? I'll give you a minute or two to think about it.............
...........Well, it says the physical reality is not congruent with what those test subjects thought was going on. Still, every week on some bike forum somewhere, someone will say that they need a "stiffer" set of wheels. Hmmmmm. Golly, how do they know? It's their own personal bias that produces that "need."
Go ahead. Read all of my posts. You'll find I've never said that someone shouldn't buy what they want or feel that they "need." I have said that feeling of "need" is not necessarily correlated in any way with the physical reality and that "need" is likely the result of personal bias in the interpretation of what they "feel."
Now, don't you think it's a bit pathetic that you derive a "good feeling" from finishing ahead of someone on a bike more expensive than you? I mean, that means that you made the asinine presumption re: what that other racer's motivations were for buying their bike......or do you have some prescient skills that you've been keeping secret? Eh? Man, being happy over such a juvenile presumption is, well, sad.