Restoration will always be one of the most controversial subjects. It is soooo subjective despite how black and white we often try to make it. Flynn for example often didn't build many of the bunkers he had planned for his golf courses until he saw how the course was played for a few years. Some architects like Colt developed suggested tree planting plans for their layouts, some built tee elasticity into their designs and routings, ... So what do you restore? I do believe, however, that most architects had certain design styles and preferences and if you study enough of their work you can figure this out. That coupled with extensive research into finding old drawings, early aerials and old photographs and you can probably get close to understanding what was once there. It is a lot of work and not many architects want to take the time to do all the research. And then some like Tom Fazio will state as he did in his book (I am paraphrasing a little) who cares what some dead guy did 100 years ago, I can do better 😊