Typically when buy components and build your own, it is up to you to do your own support or get it from the vendor that sold you the hardware. This is not restricted to Intel and ASUS, but the industry norm. So to say you will never buy Intel/ASUS for this reason means you will be left with buying nothing, because what you do not like you will find is the norm. Virutally all the companies phased out tech support so they could lower their prices.
As for getting support from component manufacturers, most of the time it would be useless as they only provide a piece of the picture. It is hard (sometimes impossible) for them to tell you for sure the problem is or is not theirs. They would likely just blame on another company and fluff you into a circle of phone calls to several companies (I think you are better with nothing then wasting money on a circle of long distance calls).
I used to tell people to buy a brand name PC if they needed support, but I no longer recommend that. I don't believe their is such a thing as getting good support any more (well, not support bundled with a PC). Unfortunately when PC prices dropped through the floor so did good tech support. Hard to employ good/experienced techs on such a small margin of profit. And if a PC vendor charged a lot for a bundle with quality support most consumers would miss that and go with the cheaper pc.
Now I tell people, you know someone that is good with PCs make them your friend (a close friend if you need lots of support).
As for your frustration, I could only recommend that you see a PC problem as a challenge and try to enjoy the challenge. I love when PC does not work, it gives me something to fight with
