I've been trying to learn how to cook ever since I moved roughly 3 months ago. My early attempts at replicating others' recipes had paid off decently so I attempted the hack-stuff-together approach on a couple of occasions. It did _not_ go well. :-/
I ended up with a ton of wasted ingredients not to mention the significant amount to time spent in prepping and later, cleaning up.
That said, I agree that (with a bit of experience) this approach to cooking is a lot more fun. As a comment elsewhere on the page says, cooking for yourself could sometimes be a pain (especially after you get home from work) and thinking of it as a side project really helps.