Parliamentary systems don’t imply proportional representation necessarily. Commonwealth nations like Canada and the UK use the Westminster system, and use a first past the post system derived from that tradition for example. It simply depends on the country and who decided on the details of the electoral system.
Like how Parliaments work - proportional vote.
56% R, 39% D, 4% I = 16 Republican representatives, 11 Democratic representatives, 2 independent representatives.
Parliamentary systems don’t imply proportional representation necessarily. Commonwealth nations like Canada and the UK use the Westminster system, and use a first past the post system derived from that tradition for example. It simply depends on the country and who decided on the details of the electoral system.