I still don’t understand Campy/SRAM running such tiny cassettes where there is identifiable drag/friction. SRAM pro teams are running 12 speed groupsets as 11 speeds. Especially when people are getting areo bars/bottles/speedplay/socks areo covers to save 0.5 watts.
If there is a tooth capacity limit I’d rather run 12-50 or something like that, I rarely end up in the 11t when on rolling gravel so I’d rather better climbing options and if I run out of top end get a larger chainring.