But still - this wasn't advancet diplomacy in EU4-period-style and when country X lead to sumpremacy - other powers have lost their desire to cooperate. Desire to cooperate with hegemony had weak or weakened states, tribes etc. Good solution are in Rome2:TW - if you are great, more states don't like you.Diplomacy was actually fairly sophisticated during this time period, with proxy wars, client states, and other great power shenanigans.
Once a great power, Rome made extensive use of client states, and guarantees both to expand its power and to control its periphery. Caesar's conquest of Gaul, for example, was officially motivated by defending one group of Roman-allied Gaulish tribes from another, while the Second Punic War was officially motivated by Rome intervening in defense of the Spanish city of Saguntum against a Carthaginian siege. And plenty of other areas under de facto Roman control were nominally ruled by local puppets (whom Rome might or might not end up eventually removing and annexing when they felt like it); Herod the Great (who ruled Judea around the birth of Jesus) being one famous example.
Third Macedonian War was based on this, that Macedonia had more "dislikes" than "likes". In this system this war wouldn't be problem - more powerful Macedonia is more liked in region so why call Romans?
And other important fact - nobody like Romans when Rome had supremacy on mediterranean basin. Roman senators demanded for themselves a respect equal to the king by others monarchies and others.
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