Why a smaller hull did not guarantee rapid U-boat construction

Would dividing a Bismarck-sized dock into ten U-boat docks allow much faster construction?

Faster construction is not established: submarines remain complicated to build even though they are much smaller than battleships.

A viewer proposes splitting a Bismarck-sized dock into ten submarine docks to produce boats much faster. The answer challenges the promised time saving because a submarine remains a complicated vessel despite its smaller size. It does not confirm that the proposed ten-way division would be workable.