I'd agree that you know when you've mis-hit a shot even with cavity back irons (or even 460cc drivers). I'd agree that mis-hits, to a degree, don't lose as much distance as they used to with persimmon or blades. I'd debate though that cavity back irons or large headed drivers significantly reduce side-to-side dispersion.
Pat, you've done it again. You've referred to unamed studies,
The studies on mis-hit shots, from drivers to irons has proven that.
And then you never cite the study in response to direct questions. You refer to them to support your points, then you should cite them. This time you evade by referring to Rugge's "comments"
Jeff Brauer answered your question when he referenced comments by Dick Rugge.
Are Rugge's comments based on the studies you refer to? Have you seen the studies? Can you bring them forward for our education, or will you continue to avoid and tell us to find them ourselves?
Interestingly Jeff's description of Rugge's comments:
At our ASGCA meeting last week, Dick Rugge discussed a lot of that. It seems that with new drivers, fw can now be 25 yards wide, and at the Open, players hit it with the same frequency as ten years ago at 30 yards. He attributes that to the big face.
He thought the grooves on the irons helped accuracy - 50% of shots from rough hit the green on the pro tour. There are limited studies on club play, but one suggests that greens are only hit 13% of the time from the rough.
talk about grooves (not perimeter weighting) help accuracy from the rough for tour pros. Do you suppose that means distance control accuracy or spin to stop the ball on the green if they get the right distance? Which raises the question, when you talk about dispersion are you talking about side-to-side dispersion or length dispersion?
If side-to-side dispersion, I think that face angle at impact determines the dispersion pattern in irons. Also true with large headed drivers with the exception that the gear effect induced by the face bulge tends to return balls hit off centre on the face to the intended line of flight. What features in new large headed driver do you suppose actually help reduce side-to-side dispersion? How do they help improve the face angle at impact. One of the common complaints with large drivers is the difficulty of returning the clubface to square at impact.
And, back to the architectural side of the question, I'm not sure for which kind of player you're asking whether "precise distance" should be a focal point of design? For the pros, and maybe excellent amateurs such as yourself, it should be. But, the vast majority of golfers rarely hit greens in regulation as it is. Give them tougher targets and it only gets worse. Should there be tournament courses that are geared for high level competitions, where the average player just has to live with the carnage the tougher target greens would wreak?