And it would be perfectly fine at any number of other large businesses, including some of the country's largest law firms, some of the largest financial services companies in the world, and several health information providers.

Indeed, and I've never claimed otherwise. (Obviously I personally disagree with such a policy, but that is immaterial to this debate.)

Please remember that the question here is whether some sort of generic laws or regulations might implicitly require an employer to have the power to compromise their employees' personal phones and wipe their personal data, given that none of the people arguing on legal/regulatory grounds has ever come up with any citation that makes this requirement explicit.

In his post, jodrellblank mentioned "industry standard practices" as an example of such generic legal wording. The fact that many large businesses accept the policy of using employees' personal devices does not make it an industry standard. The fact that many more do not does mean that it is not an industry standard.