I would be willing to sit down and theoretically test the proposition that drill is better for a privateer attacked by 3 or 4 caravels, than combat promotions. Still, a C4 privateer would gobble up obsolete units pretty effectively too.
In any case, my point was that for as many defensive uses you find for caravels there are as many offensive uses. You use drill privateers to defend against caravels. Drill IV privateers absolutely maul damaged frigates and can even have nice odds against injured destroyers. D4 frigates would be better against injured destroyers though.
The extra xp earned by a D4 obsolete unit is often enough to make me not want to upgrade the unit and regularly use it for mop up until it has an insane number of xp, then upgrade.
In any case, my point was that for as many defensive uses you find for caravels there are as many offensive uses. You use drill privateers to defend against caravels. Drill IV privateers absolutely maul damaged frigates and can even have nice odds against injured destroyers. D4 frigates would be better against injured destroyers though.
The extra xp earned by a D4 obsolete unit is often enough to make me not want to upgrade the unit and regularly use it for mop up until it has an insane number of xp, then upgrade.
