If this thread wasn't trolling, I don't know what is!
I guess there should be recognition granted for having trolled on the subject of fishing, but still...
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I hate seeing threads like this. They almost invariably follow the same pattern. "What's the point of X, why not, or just, use Y?" Even if there was an ounce of genuine curiosity in the question, inevitably the following posts make it look like the real reason for asking such questions is some kind of one-upmanship.
There are plenty of folk who fish with bait for whom fishing has no more point than it does for those that fish with flies. They all do it because, for them, it is fun, they enjoy the process and activity, even if there is no meal at the end of it. Just like people do lots of stuff for fun like playing instruments, playing billiards/darts/bowling, going camping, wood working, bird watching, or just watching sport on TV.
Anyway....I need to go back to my fly tying bench!