Why an overseas squadron becomes a mixed force

How historically accurate is the game’s roving mixed squadron and its success against several patrol fleets?

The success is generous, but a mixed squadron is plausible because overseas formations rarely remained as homogeneous as when they left Britain.

The Pirates of the Burning Sea force is interpreted as a Royal Navy-style squadron operating in the Caribbean. A formation might leave Britain with a homogeneous set of ships but lose that uniformity through detachments, casualties, reinforcements, and locally available replacements. A mixed collection is therefore plausible after sustained overseas service even when it would look untidy on a fleet list. The game is more generous about the squadron defeating several patrol fleets, so the force composition is more historically credible than its success rate.