I think this is akin to asking "why study computer science when you can just think it up yourself". The answer being you won't even have anywhere to start and y

I think this is akin to asking "why study computer science when you can just think it up yourself". The answer being you won't even have anywhere to start and you certainly will write bad software if someone did give you a computer to type away on. The field of computer science is much younger and smaller than philosophy. Why stand on the ground when there are a multitude of giant's shoulders to stand on?