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Ste_S
Hard to say, since things which appear at first glance to be tied up with string turn out on closer inspection to be held together with bailing wire, twine, zip ties and gaffer tape.
Competition records have improved by about 10% since they were last set on road bikes, but how much of that you can ascribe to individual interventions is moot - in the intervening period, frames switched from round tubes to wings, skinsuits got dramatically better, training and testing got more evidence based.
This is why you want to do some TTs on your steel road bike first, before setting off down the rabbit hole. It's perfectly possible to enjoy TTing fully without ever changing to a different bike.