You might use a computer to access the Internet. Do you know how it has been manufactured? Can you name the components that are inside? Most of the Desktop-PCs and Laptops that you can buy today are based on proprietary technology. That means, even if you know all the components in your computer, you have no access to the schematics or to the so called Firmware components that are in use.
In consequence, you trust a random hardware vendor. Even if you would like to, you could not verify how your computer has been build. You might argue that anyhow you don't have the knowledge to do so. If that's the case you could hire someone to do it for your. Or you could rely on publicly funded and well documented reviews which are likely going to exist as soon as the specifications are available to everybody.