This is even true with cars. For example, an Austrian company, called Steyer something, makes the current Supra that everyone thinks is a BMW. The fact is that the BMW is also a Steyer, as are all 5 series BMW's, the Mercedes G series etc.
You mean Magna Steyr, who would be similar to Foxconn in that they are a contract manufacturer, but in the same sense Apple phones are very much Apple products and not Foxconn, the Supra is very much a Toyota, as BMWs are BMWs. Yes there are companies that simply sell products that are made by someone else, called private labelling, your examples are not an accurate representation of this even if Foxconn especially participates in this practice.
Everyone wants everything cheap, now, and from anywhere in the world. Support costs money. Given the choice of paying $1,100 with support of $1,000 without, most will take $1,000. What does a 15 minute phone call cost a company? Every time you need to "touch" the customer, it costs money. That comes out of profit which after everyone is paid may not be much. Companies makes choices. I suspect most here own cars. How much direct contact have you had directly with the car manufacturer and not their independently operated dealers? If you a customer that expects lots of support, pick companies that specialize in that and expect to pay a premium.