Because of two things. One being courtesy, second not being a licensed electrician I rely on electricians to install wiring, lighting and all electrical components. Most jobs take into consideration the lighting layouts above bar areas and inside cabinetry, type of lighting for cabinetry design, etc. I found that communication works well and as a team effort to do layouts prior to cabinetry installation and what is ahead for them as well as myself when the cabinetry is installed. This also keeps the General Contractor and home owner happy and intern creates a better re pour between two trade people. On occasion if the project is small I will wire in lighting and components but very seldom. The same applies with plumbing. Wiring in an outlet and having an unknowing electrician flip on a circuit breaker will wake one up trust me.