> As i see it, Romans mainly gave us idea of "rule-based society" on which entire Western world stands.
Rule-based societies predate the Romans by a lot of time ; Romans weren't even that good at it, considering how often violence was used as a political tool during the republic.
The administration and institutions usually survived a lot of political turmoil in Ancient Rome, but yes, compared to more autocratic kingdoms / empires of the time, transfer of power was probably a much more fragile affair (even in the Empire).
Rule-based societies predate the Romans by a lot of time ; Romans weren't even that good at it, considering how often violence was used as a political tool during the republic.