Why torpedo-battleship ideas survived Tsushima

Why did Russian and American designers still consider torpedo-heavy battleships after Tsushima?

Torpedo range was improving, and designers hoped that a sufficiently large salvo could cause the underwater damage needed to sink a capital ship.

The earlier discussion showed that short-ranged fixed tubes were badly matched to battleship gunnery ranges. The concept nevertheless survived because torpedo range was increasing. Designers could also imagine a large salvo opening many underwater holes and producing decisive flooding. A weak first generation of a weapon can remain attractive when engineers expect rapid technical improvement.