[thinkharderdev]

If two people could get the same result then that would be strictly better, but I think the issue is that two people couldn't (or at least the two people you actually have instead of two hypothetical people who maybe were more capable). But output doesn't scale linearly with number of people involved due to various coordination/communication issues. So I think the root of the intuition we have that there is more "wasted" effort is just that people are building larger, more complex systems that need larger teams to build and the larger teams spend more effort (on a per-person basis) on coordination.