Please for the love of god they're destroyers this should not be happening.
I am not sure how to further add input to this discussion at my low skill level. Perhaps Seraphim destroyers are overpowered in such a way that I do not comprehend (this is not what I have been told, I have always been advised aeon destroyers are op) and that this is a manner to balance this.
But if it is not, and simply a legacy of the base game, I would humbly petition that a low ditch that a two farmers and their sister wife raised with a shovel in half a day's work should not completely counter their navy to ground capabilities.
Here's a replay according to the guideline but honestly no need to watch it the picture says it all.
I've had this exact issue lose me the game on Seraphim glaciers too.
I hope better players than me can discuss the issue and explain either why it is necessary or unnecessary.