New technology changes warfare without erasing its problems

Which science-fiction mistake makes far-future forces look as though they learned nothing from twentieth-century warfare?

Visual-range combat is one example, while the larger mistake is assuming new technology erases every earlier operational lesson instead of modifying the old problem.

Visual-range combat is one recurring science-fiction mistake that points to a wider historical problem. New technology can modify how forces fight, improve particular capabilities, and create new constraints. It rarely erases every previous problem at once.