The reasons why are because the system is from back horse transport days with no mass media, in a nation even as large as the 13 colonies with the poor roads and effects of weather from November to January the many steps of the electoral process are to help accommodate that.
Changing things in the US Constitution require Constitutional Amendments which require strong majorities in either Congress or the State Legislatures to enact. With our ever increasing deadlock and failure to compromise even updating things that both sides agree on is very difficult.
As for the history, here's just the 2016 ones:
https://en.wikipedia.org/wiki/Faithl...hless_electors
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