Why did the Romans have to close the twilight of Hellenism? How

>>2605486
Phalanx's are shithouse on hills and romans were more manoeuvrable. Also somehow the greeks forgot how to use the phalanx properly with cavalry support etc and just went back to the basic bunch of dudes with spears with no support. The system devolved into a far less effective one.

For some reason the greeks were massive autists that forgot how to wage war and how to do battle after Alexander died

>>2606997
I think it was literally because it was cheaper to do it that way, and for a while just increasing the depth of phalanxes and length of pikes was literally all it took to beat other diadochi neighbours, thus they evolved to rigidly and couldn't adapt without expensive complete overhauls of their military's

>>2607164
Also remember reading that selucius designed cataphracts to take on phalanxes head on by literally just giving them lances longer than the infantry were carrying, I can't imagine how horrendously unwieldy they would be.
He even attached light cavalry to these new units as they were so rigid in themselves they couldn't turn to face countering cavalry

>bunch of upstart happy merchants
>actually posed a threat
>unwashed barbarians that can't into civilization
>basically destroyed your empire
>basin of civilization with a formation said to be unstoppable in ancient world
>complete fucking jobbers

Roman history is fun