Why large recoilless guns would not replace destroyer torpedoes

Could experimental large-calibre recoilless guns replace torpedoes on destroyers attacking capital ships?

They are technically imaginable but inferior because torpedoes strike below the waterline while large recoilless weapons create accuracy, stability, maintenance, and back-blast problems.

Torpedoes bypass much of a capital ship's protection and strike deeply, while a recoilless projectile would probably hit above the waterline. Another objection concerns the firing platform: few destroyers of the period would provide the stability needed for accurate use of such a large weapon. Expense, breakages and heavy maintenance would add to the difficulty. The back blast would also create a serious problem on a destroyer's deck. One reply leaves more room for experimentation on torpedo boats, but the overall assessment rejects a practical replacement for destroyer torpedoes.