Designers repeatedly have to defend space reserved for future machinery, weapons, or maintenance needs. Steel may be comparatively cheap, yet an unassigned compartment is easily treated as waste during design reviews. That capacity becomes valuable when later systems need room and access without displacing something already essential. Growth margin therefore affects how readily a vessel can be repaired, modernized, and kept useful over a long service life. Crew welfare belongs in the same calculation, since gyms and other healthy living spaces should not be sacrificed every time equipment is added.
Notable Point · 4:13-5:24
Why warships need growth margin
Designers defend unused space because refits, new systems, and a healthy crew all need room that looks expendable on paper.