But theres carbon, and there's
carbon.
My beloved, and now somewhat elderly by road bike standards, alu Felt flew compared to my CF Boardman, both some the same wheels (im a DT Swiss man because of my weight). Theres a lot of overlap, and a lot of high end alumni bikes are an easy match for lower end CF.
And time and bike design moves on again, and my modern Alu framed
Ribble gravel bike on cheap and nasty Kysriums and fat rubber is a rocketship compared to the previously flighty feeling Felt. Its mjnd boggling.
The performance advantage of CF is reduced mass. Make one to the same mass in, say, a dog food and sawdust composite and
make it similarly stiff itll take the same amount of energy to accelerate and brake. Physics doesnt give a sheet that a frame of made from, only its mass - the numbers are stark.
I dont have a problem with carbon. Been there and done that, will probably again, and provided theres no visible damage an older one doesnt really worry me. But I don't buy in to the witchcraft and mystical properties of the material when used in a bicycle frame. It
can be lighter than some other materials for a similar level of stiffness, but that doesnt automatically mean that it will be.