If the foundational debates were happening today, I would argue for a 4th branch of government: operational.
A modern system should avail itself of available technology. An 'open source' operational branch of the constitutinal state would be afforded the power of runtime oversight of the executive, and ideally be crowd sourced. The issue of 'state secrets' is somewhat legitimate, but imo a healthy system would strive to minimize such requirements, and worst case it can refer such matter to the much more compact legislative body.