I agree that this is a good nuanced take. However, I find that students who have learned PAC (which usually takes quite some time) often have to unlearn certain principles to do PAC-Bayes, so my comments come from a fair amount of frustration with the topic. On the other hand, I find that teaching students PAC-Bayes from the get-go is easier, it still works for simpler models (you can derive the same PAC bounds, so you can't do any worse), and they get the full story. Obviously for those of us who learned both, it is good to know both. But I am skeptical for the next generation coming through whether it is worth teaching PAC at all.