AB probably answered more questions about what was going on during cooking than any cooking show ever made. He actually did a lot of mythbusting. I liked the show because it was not food porn. That episode interested me because of the 2Sears being compared. I think it was about steaks, grilling steaks. Not BBQ. Everyone does this different a bit.
I like steaks with first char then and just under MR inside. I like the deeper char. My wife likes her steaks charred at the end as she likes them more rare. My oldest brother thinks a char is a sin.
It is all preference. But a mentioned the episode broke the myth of searing in the moisture in the meat. The resting after cooking is the most effective way to have juicy meat. As the muscle starts to relax while losing heat the juices are reabsorbed. Besides that. Char method is a mater of personal choice. I sear first to get a nice char developed. I also cook how others like theirs.