Rim brakes are insanely simple and work perfectly fine if you get a nice set of wheels. It’s easier to get a disc brake to work with carbon, i.e. the wheelset options can be cheaper. I used ENVE 5.6 rim brake for a long time and they were phenomenal, but they were $2600. You can get extremely decent wheelsets for disc brake bikes for less than $1000.
If weight is important then the rim brake is lighter every time, all other things being equal