[lvnfg]

Yes, work will expand to fill all your available hours due to unaligned incentives between who does the work (the SWE in this example) and who decide the quantity, timeline, and cost of work.

If the SWE can finish his work faster, 8x faster in this case, then backlogs will also be pushed to complete 8x faster by the project manager. If there are no backlogs, new features will be required at 8x faster / more by sales team / clients. If no new features are needed, pressures will be made until costs are 8x lower by finance. If there are no legal, moral, competitive, or physical constraints, the process should continue until either there’s only a single dev working on all his available time, or less time but for considerably less salary.