Easier to on-board in the sense of limiting what new engineers can see, only giving them smaller pieces of access.
Otherwise it's probably the opposite, takes a lot longer for new engineers to understand the full system. Perhaps even reduces the bus factor, since less people understand all the moving parts.
Otherwise it's probably the opposite, takes a lot longer for new engineers to understand the full system. Perhaps even reduces the bus factor, since less people understand all the moving parts.