I do the same. I wish I didn't, but I don't know what the practical alternative is. I guess it's the whole reason that brands were created in the first place.
I do source some of my stuff from smaller brands and shops, whenever I can. But that's not always an option.
When it comes to software, I'm not entirely satisfied with Apple's "walled garden." But for hardware, I know that if I get something at the Apple Store, or from apple.com, I generally don't have to worry.
It's because of this that I wish Apple† would go back into some of the product lines it has abandoned. Wifi routers. Servers. Printers and scanners. Even AA batteries and blank DVD's (I still have some of both). I'm at the point where I'll pay extra for confidence in the product.
† Or some other tech company that cares about its brand.