Earlier quoted context omitted.
This would be a real challenge for some companies. Having a clear privacy policy creates a hard dependency between it and the code. And developers are notorious for not even being able to keep comments updated along with their code changes. It's not impossible at all, just in the current state of the industry there's a good reason we have vague agreements (also including good old-fashioned laziness, of course). It'd…
So what? Informed consent is also "a real challenge" for some medical studies, does that mean we should let doctors carry out unethical studies? I'm actually pretty sympathetic to Wacom in this instance, more sympathetic than the blogpost author at least. But unethical actions are unethical regardless of whether acting ethically is "a real challenge" for some companies.
Since users ”can’t be informed” about tracking, it doesn’t make sense to discuss whether they “should be informed”.