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Interesting video
But honestly when he talks about no difference between frame materials I do not think you get the whole picture by measuring "vertical" deflection alone.
After all he starts the video by comparing the diamond frame rightfully to a truss structure.....
So yes we can basically stop there & really no need to go much further down that vertically stiff road...We know it is vertically stiff due to shape
So we can work with contact points & seatpost etc. to improve comfort
But he never talks about lateral deflection & what that gives impression wise to a rider.
When folks talk about the feel of steel or steel being lively IMHO this is what was being discussed
Simple test
You can stand on the side of a bike hold bar with one hand & with pedal/crank at 6 o'clock put a foot on pedal & push towards the crank. This shows how much BB lateral flex that bike has.
I am not saying a lateral flexing noodle is good but
I was always under the impression that was the spring/liveliness we felt on a good steel bike.
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