That's 5 examples you gave in /hundreds/ of years. During later periods where naval technology became more advanced, you'd have as many battles as that in the course of a single war. As mentioned by Chamboozer, they were far too rare to be included, at least without doing a ton of work to ensure that they actually happened with plausible irregularity. Naval technology was quite rudimentary and naval battles actually happening occurred at very specific landing points or by dumb luck. It's not like the Wooden Wall where you had some level of meaningful range -- you essentially had to be in 'melee range' to engage in battle, which was not easy on a boat.
Edit - 4 examples, one took place well beyond the time scope of the game. (One took place before also, but, I think that still counts for the purposes of 'rudimentary naval technology'.)