Hi Mark,
I have wanted to gain a greater underdstanding of MacKenzie's past works. My suspicion is that he was never in favor of straight lines. The responses to date confirm my suspicion.
Your point that the East Course could solely be attributed to Russell is a valid one, and one which I'm not disputing. The official explanation for the new tee shape is partly related to safety / boundary issues. The notion that MacKenzie favored 'more robust, rectangular tees' has also been proffered by some.
Mark, your post leads me to expand on thoughts regarding tee shapes, and their effects on aiming, ball trajectory, OOB counts etc.
I wonder if any reliable scientific research has been conducted in times past, with regard to tee shapes and driver dispersion patterns.
Matthew