Why US two-ship classes were supportable

Why could the US Navy support many ships built in pairs when German paired classes created logistics problems?

Greater commonality and a far deeper American logistics and industrial system compensated for small class sizes.

The answer distinguishes class count from the underlying logistics burden. US ships shared more equipment across classes and belonged to a much larger maintenance, supply, and training system. American battleships also developed in recognizable iterative families, from Delaware through New York, Nevada through Colorado, and the later North Carolina-to-Montana sequence. German paired ships could differ even within a nominal class, while successive classes often reworked their internal systems almost from a clean sheet. The smaller German industrial base consequently had less capacity to absorb variation that American depth and commonality could support.