I said "almost" OCD with the intent of being obsessive with observing, thinking how to make it better, doing so, rinse and repeat. As product photographer for over 40 years, for the uninitiated to watch the process, it's about as exciting as watching paint dry.
Of course you can sharpen one object and not others, that is through the use of masks in post processing. Global sharpening should be avoided unless doing so is judicious with the goal of it not being obvious and avoid creating artifacts in areas that degrade the image.