Qin Shi Huang vs. Sima Yan: They have quite a lot in common

It's as if they started by inheriting everything their predecessors built, essentially taking over the world for free.
They don't seem entirely incompetent, but they are somewhat disorganized, so they can't quite be called great rulers.
And they completely ruined their empires in just two generations due to poor succession planning.
If someone saw this, they'd think it was a copied screenplay lol