Isn't It Possible That Major Bike Maker Geometry Simply Isn't Really That Great In Some Cases

Especially for the smallest and tallest riders.  Yeah, most of the riders in the pro peloton are riding stock plastic bikes, very similar or identical to the ones those big bike companies sell, and yeah, most riders don't NEED a custom, to-the-millimetre-and-the-tenth-of-a-degree frame, but the pros ride a shitload of hours every year--each europro rides more each season than a hundred serious 35 year old amateur racers put together--and if the Specialized or Cannondale or Trek designs are not that great to begin with--good enough for the most part but not maybe the best for you or me or some professionals--any and all shortcomings and quirks could turn out to be a fucking disasters for a professional racer.  Because those frames are going to be sold all over the world, a thousand compromises are made for the marketplace, but that marketplace is not the world where professionals race.  And some decisions about geometry made by the big bike companies are going to be wrong or bad because most people are fucking morons and large organizations can make fucking morons even worse, but now those bad choices and/or mistakes are locked into a design that has to last for years in order to pay for itself.  It's not a stretch--see what I did there?--to say that there are more compromises in fitting many professional riders to mass-marked racing bikes today--less than optimal frame sizes, top tube lengths, setback, stem length, steering geometry--than in the custom steel and aluminum frame era and that those compromises might make some pros less comfortable and safe on their bikes.  DeRosa, Masi, Merckx, Bianchi, Pinarello, Colnago, Della Santa, Ritchey, and Landshark all knew how to design and build customs bikes for top-tier professionals, and they all had the luxury of not needing to sell fuckloads of identical frames because of the costs of molds, plastic, and Chinese contract manufacturing.  Nobody's going back to custom frames for pros, but that doesn't mean that five or six frame sizes will fit everyone, including UCI professionals, as well as 15 sizes between 47 and 64 cm with the option of full custom.