Yet I also feel like John Carmack probably probably isn't remotely near the level of Pearl (I'm not that familiar Carmack's work): pushing forward video game development doesn't compare to neatly figuring what exactly causality itself is.
You're looking at the wrong thing. Don't look at the topic of their work; look at their cognitive style and overall generativity. Carmack is many levels above Pearl. Just as importantly, there's enough recorded video of him speaking unscripted that it's feasible to absorb some of his style.
In light of reading Hazard's Shortform Feed -- which I really enjoy -- based on Raemon's Shortform feed, I'm making my own. There be thoughts here. Hopefully, this will also get me posting more.