I'd have to challenge the premise a little bit. I think you mean that Jack was out of touch with where Daly hit it, not his "pedal to the floor" mentality. But, maybe I'm wrong on that, in which case disregard.
The '78 Open and the '95 Open are two of my favorites ('95 largely because of Jack's commentary), and I watch them (the back 9 Sunday anyway) regularly. To be sure, Daly hit it longer than Jack even in his prime. And Daly was probably a bit longer than the "field" than even Jack was when he was belting it in his younger days, but Jack too was once quite a bit longer than the "field." So, I think Jack was pretty in touch with Daly's game in regards to where he hit it. And the course in '95 and '78 was not that very different (wind of course being a different matter). So, although I never compared, I bet Daly was hitting it further than Jack ever did at St Andrews playing roughly the same tees.
BUT, I think Jack was "out of touch with Daly's game" only in the sense that Jack played much, much more conservatively by nature. Coming down the back 9, Jack was beside himself that Daly kept hitting driver (way left). Jack just couldn't understand why Daly would take the risk with driver. In '78 Jack wasn't even ahead, and he played very, very conservatively down the stretch. Even the announcers (some of whom like Bob Rossburg actually had a clue) were even shocked how conservatively Jack played down the stretch. But I personally don't think that was because Jack could hit it where/how Daly hit it, but rather that he was just very risk averse (not to mention a phenomenal long iron player). So Jack would never take on that risk. Daly on the other hand, just figured this is how I play, and if I hit way left, I won't go OB, and I can hack it up to the green and make 4s. Jack figured the best way to make 4s was to be in position, even if well back.
I think Arnie would have understood Daly's game just fine. And I don't think Jack always understood Arnie's. I think Jack understood Tiger's game just fine and he hit as far as Daly. I think Jack and Tiger were so much better than everybody, they just figured they could win more by playing conservatively. Other players even great ones like Arnie or Mickelson are just wired differently. And the "average player" just figures he has to play aggressively and if he's hot he has a shot. If he's cold, he has the weekend off.