Hey, yeah, you’re right. We definitely had the ability to disable edit history (which is on by default, and @codinghorror frequently maligned). The setting for this appears to be gone from preferences.
Whether or not this is a coincidence, this is definitely new.
ETA:
Here’s the previous discussion on this:
ETA2:
And this:
Just to prove you’re not insane and there was an opt-in/opt-out toggle:
