I run the resi dept in a larger electrical company that primarily preforms commercial work. On larger commercial projects the electrician will carry subs for data, security, AV, etc.

On resi projects we have the ability to build a relationship based on trust and transparency with the customer or their reps.

On commercial it's very black and white and people will try to screw you over. We have a lawyer on retainer now, and there is usually ongoing litigation of some sort.