Paradox have too many grand strategies. They need to make just one game that spans from 6000BC to 2500AD.
Im a big fan of the purge the galaxy of xeno scum so my cute aliens can convert everyone to food as was ordained by dear leader. Long live the empire, least till the late game crisis unless you become the crisis.
Also planet crackers, the right way to create a neutral zone and mineral source.
Allow Some of them do have Mechanics to Port over a game from one to another
I don’t think it is feasible to build one without a massive scope creeping. The grand strategies have very different focuses depending on the era.