Just because it can hold up to a race, doesn't mean it's worth the extra work for marginal gains. They may be babying things to keep it from blowing apart, while I'd like to not really have to worry about that. My long term goal is to have the 4.7 V8 in the 4runner, so I need it to withstand the higher HP, more weight, and larger tires all while not having to baby it. That's the goal at least.
If you look at the build it's 3.5+ long travel with RCV Axles, an Atlas, and 35s on beadlocks. So if the 8" clamshell can hold up to a 4.7 V8 through a long travel beating and locked front/rear crawling in a race situation I'd say it's pretty well tested for strength. They're going to put that thing through a much more rigorous workout than we ever would on a typical run out. I doubt he's going to baby it.