Decreasing working hours increases labor availability (=> so you'd expect people to get paid less as a result), but higher headcount for comparable output is also totally undesirable for an employer: The only potential benefit is some limited redundancy (bus factor), but this comes at the cost of communication overhead (meetings), decreased software design coherence, no "single source of truth" (person), all of which cost money/time to mitigate.

I don't like it, but I understand why we ended up here...