The Baltic situation with the galley fleets struggled precisely with trade offs between firepower, speed and manouverability (and crew comfort to some extent).In restricted waters where distances traveled were short, and you were not expected to go up against lol arge ships of the line, galleys may have made sense. But the number one naval power in the world, Britain, largely did not use galleys after the early modern period, showing that galleys had only limited usefulness.
The Swedish Archipelago Fleet after 1760 introduced a new class of "Archipelago Frigates", deeper draught, three masts (better and more spcaious quarters for crew), one or two gun-decks, these being broadside ships. What they provided was better sailing vessels, with more firepower, that were also fitted out to be rowed when necessary. The problem being that the rowing speed of these Archipelago Frigates was only 0,5-1 knots.
This being a model of the "Hemmema" class 32-gun frigate, HMS "Styrbjörn".