How ironic, that you are calling me a flat-earther, but you don't understand the basic geometry of a circle. You think the most important distinction between modern and old-school technique is linear vs angular momentum? Yet, you have no idea what those terms mean. When someone is using angular momentum, they are also using linear momentum. Any angular movement has linear components.
When Raphael Nadal hits a forehand, he is using both linear and angular momentum. It is not a case of either or.
If you want to break it down even more, it's also stance and situation dependent. All the top pros like Nadal, Federer, Djokovic, Murrary, etc. excel in a variety of situations. Depending on the shot they are returning, and the shot they are executing, their strokes will have varying amounts of angularity or linearity.
It's never been a case of Linear vs Angular. It's a case of linear and angular. Ironic that you Limpinhitter, are calling me a flat-earther, but you insist on seeing things in such black and white terms. It you're going to throw around the terms linear and angular momentum in so many threads, maybe you should sit down and take some time to understand what they actually mean.