I think it's time to have some user-selectable settings.
One should either be an on/off or slider for in game sound fx.
Another I would request is notification events. I wish for there to be an option to show all events that occur in my sonar radius.
For instance, tell me any time an adversary launches a sub, whether it is aimed at an outpost or sub of mine or not.
There are many scenarios I want to be notified of. If another player reinforces one of their outposts. If a navigator is launched towards me, whether aimed at me directly or not.
Not having these kinds of notifications (and the fact that some notifications are still delayed) keeps this game one of regular checking in if I don't want to be bushwhacked.