Would Queen Mary's survival have prevented the Admiral-class redesign?
Short answerNot necessarily; battle damage and its investigation could still feed valuable lessons into the redesign.
NotesA sinking was not the only source of tactical lessons. Investigators also learned from ships that returned with battle damage. A surviving Queen Mary would probably carry damage whose study could feed the post-Jutland reassessment. Her survival therefore need not preserve the original Admiral-class design and might provide additional evidence for Hood's redesign.