I don't think that Dexter took care of himself, overall, seemed like he was a serial relapser. And that took its toll, no sense in pretending otherwise. But the final toll came later than some are claiming. And before it did, that behind the beat thing could be mesmerizing, as is any sensory experience where you feel like collapse is imminent but never comes. It's why people like rollercoaster and drop rides and stuff like that. People like to play with physics,
Manhattan Symphonie is the last record where the imbalance is under control, imo. And the later run at Prestige was mostly not the best (but there are a few exceptions). Those Steeplechase records are all rock solid.
So at some point, the claim must be conceded on the strength of the evidence, but not nearly as early as 1970. Nooooo….