I've been thinking this recently as well. Some problem spaces are definitely very amenable to being transformed into a purely declarative language like YAML but

I've been thinking this recently as well. Some problem spaces are definitely very amenable to being transformed into a purely declarative language like YAML but, while builds look like that at first glance, I find that turing-complete-code customization is required just a little too often for it to be worthwhile. YAML is a way better way of doing it than the current jenkins way though.