Ultimately it doesn't really matter anyway. Unless you are the worlds most wanted criminal and Apple is working with the government to track you down via your turned off iphone. And in that case, you should have done your research to see this anyway.
If the average user blows past this message, it has no impact on their life.
From the referenced tweet thread about someone finding this out for the first time:
In other news I updated my phone to iOS 15 and put it down to charge last night. When I woke up it was hot, and my battery has gone from 100% to 15% since 7:30am. I gotta get off this ecosystem.
"My phone's battery life has suddenly become much worse" sure sounds like a major impact to me.
That has nothing to do with this change. It doesn't even seem like they had their phone turned off for this to be in play anyway. The most likely answer is that they hit a bug in the new update or that they placed their phone off centered on a wireless charger. I'm not sure why the general public should care about rare bugs in day one updates which get patched pretty quick anyway.
The turned off pings use an ultra low power mode similar to the airtags which should last months on a "flat" battery.
The Chinese, Russians or Belarusians wouldn't agree with you. There's plenty of people there doing "illegal things". Why should you care? You never know when something can become illegal in the future or the social equivalent of cancelling. You might have made a joke that's not okay in the future, criticized a leader, read a book, played a game, used a VPN...
If the average user blows past this message, it has no impact on their life.