Well, while I do respect your opinion, I don't agree with it, especially because by default the convoys would be created and maintained by the AI as it is now; the player would have the chance to e.g. change their route (or to attach heavy ships to their escort, like BBs or CVLs, like in real life) but he wouldn't be forced to do so.
Besides, wasn't WW2 a war focused on convoys? Just think about the huge effort the Germans (and the Allies) put into the Battle of the Atlantic and what would have happened should Germany have won it.