Coolidge was a gd idiot who slept 12 hrs a night and whose deregulation and corporate pandering caused a world depression as much as anything. A W of the 20's, without the stupidest wars ever. And no, the 18th century doesn't work anymore. Never did for most, despite ignorant GOP dreaming.
Coolidge was certainly off the mark when it came to regulation. He was too hands off, and it did help to set up bad times. That being said, if Coolidge had been reelected instead of Hoover winning, the Great Depression probably would never have happened.
All that being said, regulation policy is not taxation policy. That Coolidge was wrong on regulation does not change the fact that he was very, very right on taxation and spending. No other President since Coolidge has left office with less public debt than when he entered office.