It’s a start, but three party (or more!) systems are dodgy, IMHO.
The flaw in parliamentary systems.
runoffs would fix that
Well if you think the US system is odd consider that the UK now actually has basically a six party system. In addition to Labour, Conservatives, and Reform there are the Scottish and Welsh Nationalist parties which want varying degrees of independence and the Unionist party in Northern Ireland which absolutely does not want independence or union with the Republic of Ireland to the south. Labour polled about a third of the vote in the last election and thanks to the first across the line electiopn system garnered 2/3’s of parliament and is good to go for six years despite the fact that they are currently down to about 26%. It is roughly the equivelent of Joe Biden running for president and winning 2/3s of the House and Senate still being as popular as a turd in the punch bowl.