How ocean-liner races affected navies

How did competition over ocean-liner designs affect navies?

Navies gained useful turbine and engineering ideas, but the largest liners were too costly for routine armed-merchant-cruiser use and proved more valuable as fast troop transports.

Turbine technology was a useful naval offshoot from liner development. The biggest liners, however, were too large and expensive to operate as practical merchant cruisers. Their speed and carrying capacity instead made them valuable troop transports in both world wars.