Quite right. It is called tying. It is illegal when you have a monopoly, and legal if you have no monopoly. That is why Dell has to give you a refund for the software if you don't want Windows (90% market share), but Apple doesn't have to (10% market share).
The footnote makes this quite clear. If there was a printed license, then you could read it before you broke any seal. If there was no printed license, and you had to break a seal to return the software, then you can return it, even with a broken seal. That is perfectly fair and also legal.
The UCITA has even a special rule if someone created an installer that only shows the license _after_ installation. In that case not only do you have the right to return the software _after_ installation (no matter what the license says), they even have to help you removing the software and putting your computer back to its original state or pay you for your work if you have trouble doing it. Doesn't affect Apple because the installer always shows the license before installation.