If you wait by the time you have the cruisers tech you already lost the game.
You guys must be finding destroyer tech in your tech choices alot earlier than me. From my experience, if your opponent wants to swarm you with corvettes, he's gonna do it long before you field many (if any) destroyers.
It doesn't really matter when you get destroyers, since from a pure financial standpoint, you can get the upper hand on destroyers simply by going slightly over you fleet cap with corvettes. Those corvettes will have the same initial buildcost, the same total monthly upkeep and still win every time.The corvette spam is actually one of the most annoying things in the game right now. Most RTS games allow you to have quick progression towards the 2nd type of unit. In Stellaris, this is not the case. Getting destroyers can sometimes take 30-40 years in game if you don't get good engineering systems nearby.
It was massively simpler to just repeat some of the tests with laser corvettes vs. laser destroyers, and then upgrade the destroyers with cloud lightning.@Grubsnik , Well done!
Something to note, though. Currently mass driver series have about 27% more damage per day than their intended value (that is, dpd of laser / missile of the same level). Autocannons may have about 25% more, too. Would you mind to test when those weapons don't have such advantage? I expect most conclusions are un-changed, though cloud lightning may shine more than in your previous test.
Pure laser:
Cloud lightning upgrade:
So the balance is still off, but cloud lightning is definately an upgrade over T1 medium Laser