Brand identity is simply what you stand for. Had Trump campaigned as a peace-loving chocolate boy, he surely would have been selling used cars for a living.
You’re not Trump, but you possibly are a business swimming in an ocean of competition. You either stay afloat by having an identity or you sink as an unknown wreck.
If you want to be the cream of the crop, you have to abandon your cupboard love of having nothing else but a logo. Brand Identity ranges from the way your laptop bag is designed, the way you speak on call to the colors you use for envelopes!