I appreciate this trend toward breaking up the empires into their more true and decentralized forms. These empires weren't some uniform and centrally administered monolith, they were in fact loose federations of client states and tributaries ruled by local nobles and nominally loyal to a common overlord. Most of these client states were watching for the slightest sign of weakness in their overlord so they could stop sending their regular tributes and quietly slide into de facto independence. The Satraps in Mesopotamia and Persia were notorious for this and "empires" in the region would in practice dissolve and reform in a very fluid way based on how powerful the current overlord was in any given year even though nominally they had all sworn fealty. Persian emperors for millennia spent most of their waking hours fretting about subject loyalties and playing Satrap whack-a-mole year after year.
I could not possibly agree more.