Would better bulkheads have saved Britannic?

Would the proposed bulkhead improvements also have given Britannic a better chance of survival?

They would have improved Britannic's chances by buying time for damage control, but could not guarantee survival against every pattern of damage.

Compartmentation buys time rather than guaranteeing survival. More divisions in the hull can slow water spread, preserve damage-control options, and sometimes stabilize a casualty, but a sufficiently damaging hit can still defeat them. Weapons, explosions, or an iceberg can strike precisely where protection is weakest. The difference is between a difficult emergency with time to act and one with no margin at all.