The other thing is that beyond the heat issue, riders require flexibility and manoeuvrability that would be negatively impacted by existing padding... and you know what they need that for? To help avoid crashes. Soft padding large enough to be effective at speed will be bulky and make jostling in the bunch more likely to result in accidents, and hard padding will impede movement and make it harder to take quick evasive action when a crash does take place. It's no good reducing the number of injuries per crash if you negate that benefit by increasing the number of crashes. Notwithstanding that protecting the collarbone against a direct blow is a relative irrelevance, given the way most collarbone injuries take place.
Your argument has been that there are a lot of options to reduce injuries without negatively impacting breathability, manoeuvrability or flexibility. You used the word "plethora". I can only surmise that you therefore think the only reason that such apparel has not been introduced is laziness on the part of manufacturers. And yet, you have provided no actual ideas of your own, just said that this is the responsibility of the manufacturers. But if you cannot provide a single one of these suggestions, then how can you claim there are a "plethora" of options?
Or maybe the options that exist have been considered already - and have been found to be impractical or prohibitive in real life situations? Or the benefit provided by the apparel was considered too marginal for the disadvantages it had and was rejected by the péloton? I mean, this can be for better or for worse. Just look at the NHL and how some players resist wearing visors on their helmets, and almost none wear the 'college helmet' with the full face cage or the 'fishbowl' with a full face visor unless they are playing with an injury, even though those are demonstrably safer, just that the perceived benefit is considered too small to be worth the negative impact in terms of field of vision? Or the time-honoured comparisons of tackling and injuries in American Football vs. that of Rugby Union, a similarly violent sport played without the helmets and with much reduced padding - because the American Football players have so much more protection, they launch themselves into challenges far more recklessly and at higher speed, negating the benefit that the protective apparel provides in comparison?
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