Carbon shoes are mainly for running use.
the carbon plate is so hard, that prolong wearing and standing on it will result in foot inflammation, so not advisable.
I have 3 pair of carbon shoes, mainly use for running, not for street walking. For street walking, I will go back to normal track shoes without c plate
really depends on many factors in terms of comfort, eg. thickness, length, position, curvature angle/position, profile, etc.
Had wore the following carbon plated shoes for casual war walking:
adidas adios pro 3 (carbon rods)
saucony endorphin pro 3
xtep 160x5.0
qiaodan feiying pb3.0
bmai jingtan 3.0 turbo
bmai jingtan mix plus
of the 4 performance level carbon plated/rods running shoes i have, jingtan 3.0 turbo feels the most natural and comfortable, in running and walking. feiying pb3.0 fare pretty well for me too, it was my go to shoe if i can only bring 1 pair of shoes to travel/walk/run, especially in summer places.