Really depends on which way you look at it. WW2 wasn't an inevitability and if WW1 can be dismissed as just a prequel to WW2 then WW2 could inversely be dismissed as just a sequel to WW1. It wouldn't preclude having a story of an escalating ideological conflict either; the Paris Commune was half a century prior to the Petrograd Soviet, the French Revolutionary Wars were obviously ideological and even before that you had the English Civil War - you'd just have to be a bit more creative in structuring it than the basic liberalism/fascism/communism. Maybe have it be something more broad like revolution/reaction and you can tailor it across a few centuries (perhaps have a third reform branch that both sides can dip into to moderate).
At any rate, I think the best point is that WW1 was the definitive curtain call to the old world and old methods of warfare. Multiple centuries-old empires were put to the test of industrialized, total warfare and crumbled. If there is any better way to meaningfully put to the test whether or not you actually have built a civilization that can stand the test of time, it's in having to commit it against the near-apocalyptic and unprecedentedly wanton destruction that the first WW1 brought about, and in weathering the anti-civilizational ideologies it unleashed. There's also simply the matter of scaling; I think most people agree that the Info/Modern eras are boring because by the time you've gotten to them there's already a clear winner. Mulitpolarity is part of what makes Civlikes fun; the fight to decide who gets to set up the bipolarity is, imo, more important than deciding which of those two come out on top.