Well, it makes the crew focus Choice more important.
I kind of imagine a deck full of activity, guns roaring and all that jazz, and suddenly a beat to arms for boarding action. Marines setup in their stations, open deck crews get their melee weapon crates, etc. Instead of everyone being already to attention.
I'd still enjoy the musketry being used indirectly and marines using shots once the ships come as close as 80 paces . Would give a little bit more use for marines instead of being boarding only.