People, you are so focused on close combat with guns... Thinking of this game as a shooter...
Its a navigation game.
I saw so many sharpeye streamers with any hand fireweapon, missing cannon shots at the same distance, whith the sea in calm and besides to an island that makes the ship stay very static... and adding the anchor down to make more stability...
Well... im always telling new sailors that this is a navigation game with shooter mechanics, but Not a shooter!
You surely think that a rifle's bullet on your shoulder is very, VERY painfull!
Its time of thinking about you, receiving, on the same place, a cannonball shot.
And Im thinking on you feeling no pain at all, and if you feel some pain, it may be short.
Finnally, you have a delay after drawing your sword before you can block, if adding a delay to the sword, it makes nonsense to prevent instant kill.
Is really bad that someone board your ship whithout your known... remember this is a slow game, not a frenetic one that you just aim and shot... You must use your intelect to sink an enemy ship, and, of course, you need some good aiming, but its not the point of the game to use broken combinations...
By the way, would be very usefull to make hand fireweapons drawing time different, depending of the weight and lenght of the cannon.
And if you only want to shot to the corpse of your enemy, may be better to start getting a mountain's bandit game.