They're still cowards who want to be on both sides and not upset their voters.
It works because of the democratic systems in place, some countries do it better than others, but it also works regardless of what the current government does.
It's also on its way out where the flanks are gaining steam and the centrist parties have to decide if they follow going left or right.
Centrist parties kinda bide their time so they can secure their seat again later on.
I mean there are people that don't fully embrace the hard left or right ideologies... and just because a centre party embrace a certain policy that align with either left or right doesn't make them 'have to chose' imo.