The Expanse and its compatibility with OA

[AstroChara]

I'm surprised nobody mentioned the lack of radiator. The overpowered engines come in as a close second. Without radiators, the waste heat from the drive would immediately turn the ship into plasma. While they can indeed be reduced, I don't believe we can completely direct all energy into the thrust. Some will remain as waste heat that you need to use gigantic radiators to dissipate.