The fact is you can do whatever you like so long as you don't exceed the levels of grip available. This leaves huge scope for different riding styles to evolve which is why there are so many "correct" ways to corner. On the road youre balancing many factors, traffic, road condition, hazzards, visibility, etc etc which makes every corner different. The best line for visibility might result in riding over a wet manhole cover for example. The best line for avoiding the manhole might make you have to go through the bend slower. The only consistent answer is do what you like so long as you don't crash!