I think you've answered your own question: who would know to buy 3 separate products, glue them together, make it work, as opposed to buying 1 product from apple, that works right out of the box?
Well, if you can't be arsed to do some research, follow instructions and combine N things to make something really good, and think it's better to buy ready-made things, you can stick to eating microwave meals while I'm having slow roast tenderloin with butternut squash and sweet potato mash. But don't try and tell me yours is better.