The two-round system is actually very similar in its dynamics to instant runoff voting or FPTP with primaries. All these systems feature a centre squeeze. FPTP without primaries is actually a better system, albeit obviously still vastly inferior to a proportional system, which is what all top-tier democracies (and economies for that matter) use. In the FPTP-without-primary era, the US still had statesmen with broad support as presidents (e.g., FDR, Eisenhower, Theodore Roosevelt), and the election of a Trump would have been unfathomable (at least, on the Republican ticket).
The two-round system is actually very similar in its dynamics to instant runoff voting or FPTP with primaries. All these systems feature a centre squeeze. FPTP without primaries is actually a better system, albeit obviously still vastly inferior to a proportional system, which is what all top-tier democracies (and economies for that matter) use. In the FPTP-without-primary era, the US still had statesmen with broad support as presidents (e.g., FDR, Eisenhower, Theodore Roosevelt), and the election of a Trump would have been unfathomable (at least, on the Republican ticket).