"Hoover was the most interventionist president the country had had to date."
This is not even a little bit true. By way of example, Hoover wanted a revision of the tariff that was limited to the agricultural schedule, which was defeated by a single vote in the Senate. Hoover didn't bother to lobby, cajole, or persuade anybody to do anything on this vote. He always let the legislature do as they wished. He called a special session of Congress, only to not bother to do anything to lead it. When unemployment hit 25%, he did nothing to push a legislative program, deferring, as all 19th century-style Presidents did, to the legislature. Deference became even more paralyzing when the opposition took over Congress in 1930, because there was no hope of anything getting passed unless Hoover took the reins of leadership.
Here's what Hoover said about his deferential attitude towards Congress
"I had felt deeply that no President should undermine the independence of the legislature and judicial branches by seeking to discredit them. The constitutional division of powers is the bastion of our liberties and was not designed as a battleground to display the prowess of Presidents. They just have to work with the material that God - and the voters - have given them."
Hoover also refused to provide direct government aid those who needed relief from the depression, preferring instead to encourage private groups to do the relieving. Hoover was content with yelling at the Red Cross to feed more people rather than have the government do it.
Yet another example, Hoover refused to call for a bank holiday, which Roosevelt did immediately after becoming President. He also implemented the Emergency Banking Bill, which in one swoop ended the banking crisis. How easy it would have been for the laissez faire Hoover to do the same thing,but instead the country got 4 years of talk.
Compared to T.R. and Wilson Hoover was not even close to being an activist President. He was a wannabe activist who was so infatuated with impractical 'constitution principles' that he let the country rot.