The electoral college was necessary because it would have been logistically impossible for people living in 18th and 19th century America to be able to participate in a single-day one person one vote election, given their level of technology at the time.
We live in the 21st century. We have instantaneous means of communication via the internet making designating an elector to travel to Washington unnecessary, a greatly expanded infrastructure via roads and mass transit for people to travel to polling places in a reasonable amount of time in a day, computers that can tally the ballots many hundreds of times faster than a human being can, and vastly expanded capacity for handling the logistics of running a nationwide election including a complex bureaucracy dedicated to oversight and enforcement of voting laws and regulations.
The electoral college is an archaic system whose only purpose has been completely supplanted by modern technology. Any notion of rogue electors defending the republic from authoritarians and populists is not only historically false, but given the fact that they failed to prevent exactly that situation from happening once already, laughably ineffective.