In TOS, the biggest fault was the Constitution class' neck. It was so thin that GOD forbid the shields went down because you could fire a torpedo or two and it would sever it. What is that? It should've been thicker. And in TMP, the pencil thin neck housed the warp core! It should've been as thick as the torpedo launcher housing so it wasn't such an obvious target
Photon torpedoes are immensley, insanley over-the-top in terms of explosive power. You can't seriously believe that thickening the neck would have any difference in unshielded combat.
Submitted for your consideration: You are building a house in a warzone. Will building the house wider and taller protect it against being bombed?