In reply to David McCan.

JetPack is a classic case in point - if ever there was a plugin that needed to be force-marched into using the customiser (to fit with the philosophy of the topic of the OP) then it is JetPack. Even with 10 years of developing sites on WP under my belt, half the time I still have no idea what is active or inactive in JetPack. Perhaps the wider WP devs community should take a spoonful of their own medicine before dishing it out to others.

... and yes, I do know JetPack is a plugin not a theme ... although when you look at its theme influencing elements (such as carousel, infinite scroll, etc. then you do wonder when it was allowed to cross the line.