I imagine companies differ somewhat on their approach. I only have one experience, about 2 1/2 years ago. My wife hit a deer in her 2007 Frontier, that we had paid $20K for when new 10.5 years earlier. It had about 85K miles, but was clean and well cared for.
It was towed to the body shop, and they started an estimate, and stopped and called the ins. co. when they got over $9K when adding the air bag. It was going to be a total.
So now the question is how big will the check be. I had done some checking and had several examples from $12k - 14K. I would be happy with $13.2K. The adjuster called me and offered $11.5K, and I told him I had a higher number in mind. He had never seen the truck, outside of some pix from the body shop. He had 3 prices (from their system), for poor, fair and good. I told him it was very clean, he said it would qualify as good, and asked me how $13K sounded, and I thought that was close enough. Sent a check less the deductible for $12.5K.
All-in-all, I was very happy with the experience.