Thomas Brown,
When Pete Dye was tinkering with Crooked Stick in preparation for the PGA I had a discussion with him on the 14th hole.
I asked him why he was altering the angle of a new tee that he was building, back behind the current back tee.
He said, in the ultimate he wanted the tour pros to have to hit 2 and 3-irons into some greens, and, he was referencing par 4's and 3's not par 5's. And, by making the changes he was hoping to accomplish that end.
In theory, if it is an architect's mission to test the golfer with the use every club in the bag, how can a modern day architect prepare that examination without ridiculous length.
Then again, if guys in the desert are hitting 285 yard 5-irons, exceptional length isn't ridiculous.
I agree, I don't think a 15 yard rollback is sufficient, it amounts to approximately 5 %, when 10 % is needed.