Indeed. In our fairly strong President system, we have a temporary king, and very much related to your point, we solve the succession problem that has historic

Indeed. In our fairly strong President system, we have a temporary king, and very much related to your point, we solve the succession problem that has historically haunted hereditary systems of nobility with things like assassinations. FDR didn't respect that, so we fixed it with a Constitutional amendment. That significantly weakens a lot of arguments for "killing the king", President for Life, etc., because you just have to wait 4 or 8 years and he's no longer has much power.