I'd speculate that, after such an age of barbaric experimentation, new and supposedly more innocuous methods that don't require physically detaining/restraining a subject have long since been conceived, implemented, and tried.
Nothing of value to society anyway; looking at the 1979 reunion video, it seems like they were pretty happy with the return on investment overall.
[0] https://www.gnosticmedia.com/ccn-unspun-020-mkultra-reunion-...
From that (odious) perspective, I don't think the experiments were ridiculous, though they did turn out to be useless. At the time it was pretty common to view breaking a personality down as a viable path to establishing control over it. The Koreans had done similar things to American prisoners, with some minor, temporary effectiveness.