We already have a mechanism to restrict choice - regulation. Turning to corporations to safeguard consumer rights will end in tears, especially if used as an excuse to curtail user freedom.
> Have you ever actually met or heard of a user [..] that cares about this?
Ordinary people don't care about a lot of things they should care about - there are only so many hours in the day to learn about issues and acquire the necessary knowledge to form an opinion. If experts in the relevant fields don't care for them, the only other ones are those that stand to profit.
I bet it would be mostly mechanics speaking up if auto manufacturers started requiring only "licensed" brake pads or blinker fluid be used. Does that mean the practice isn't car-owner-hostile?