Why 15-inch Scharnhorsts would trade commonality for delay

Would building more Scharnhorst-type ships with 15-inch guns have been more effective than building Bismarcks?

Standardization would help, but 15-inch turrets would delay construction; a mixed programme is more plausible than immediate uniform rearmament.

A common 15-inch armament could simplify training, logistics, and maintenance across a larger German force. The constraint is the availability of the guns: fitting them from the start would delay the ships. A mixed path is more plausible, with some hulls entering service with 11-inch weapons before later construction moves to 15-inch turrets. Earlier ships might then receive the heavier weapons in refits.