On marginal gains, I heard the same old thing this weekend on a ride talking about how changing some part would “only” save 40 grams. The way you lose pounds from your kit is to keep adding those up.
I think it’s the same with aero. Folks focus on how silly it might be to wear an aero helmet, or longer socks, and any one of those in isolation might be negligible.
They add up.
Former coach comes by today and shows me his new replacement S-Works Venge (prior matt finish frame cracked). This one has gloss paint and weighs 1oz more than the other. As he's at the UCI limit anyway it was a good aero investment with concluded. How much - well at least in his brain.