Smaller engine-room crews and simpler refits

A Tribal-class destroyer no longer needs three watches for multiple boilers plus steam-turbine spaces, potentially cutting roughly thirty crew positions. That reduction also saves accommodation, provisions, and hotel load rather than only engine-room wages. Modular turbines would be easier to break down and remove during refits, while eliminating much of the ship's steam and feed-water plumbing. Early machinery would still demand new training and maintenance practice, but repeated installations could make replacement and overhaul progressively simpler.