The monks likely have the time to think about implementation, and feeling like they’re part of an institution that transcends them and that they value for its own sake, they likely have an incentive to invest effort into maintaining and improving it.
Both of these are unlike, say, corporate environments, where the core work uses up almost all available time and where most people are looking mostly to extract something from the organization.
Your comment (and some others) have me imagining an alternate reality where the vatican runs the equivalent of github and all major FOSS infrastructure is maintained by religious orders. (There's probably a controversy where the catholic and islamic GPL equivalent licenses are incompatible for inane reasons.)