You aren't listening. Or perhaps the problem is that you shotgunned this question of yours out into so many threads at once, that you are not going out into those other threads to read the responses.
Yes, idle fees have been around since day 1, but not this 50% thing.
This is not true, and I answered it here:
There is absolutely nothing you can do to fight this with Tesla that won’t take orders of magnitude more effort and time than any ~$10 waived idle fee is worth. Don’t waste your time. They don’t care. All I have is time. lol. But it's more about the principle because seems like I should have...
teslamotorsclub.com
You seem to misunderstand what "this 50% thing" is.
Maybe I'm not explaining my issue correctly. I'm not complaining about the idle fee in general but when Tesla changes the rules governing them, then they should tell us.
They haven't changed the idle fee part of it. That still works the same way.
It always used to be that once you car was charged to the level you selected then you had 5 minutes before idle fees started.
Not quite. It was more simple than that. If the car stopped charging, then the 5 minute timer would start. That could be for various reasons. If someone stopped charging intentionally, if the power cut off for some reason, etc. That wasn't always specified that it had to reach your limit. Yeah, that caused some heartburn for people, but that's what it was.
Then they added a heavy usage notifications for Superchargers that were experiencing busier than normal traffic. These notifications popped up on our displays. [...] The only place you would know about this change was on the Tesla.com site. Am I supposed to check the Tesla site daily for changes?
Huh? You just said that the notifications of this show on your displays. So it is there. You don't need to go to the Tesla.com site to find that out.
But now if a Supercharging stations is at least 50% full of cars, then they reduce our charge to a max of 80%.
No, that is false. You are mixing up two things. And that's why they wouldn't need to post an announcement update to their idle fees pages--because what you are stating here isn't true, so there is no change to the idle fee policy.
I explained that in my comment I linked above in that other thread. Here's what you're mixing up:
50% relates to whether there WILL or WON'T be idle fees. That's it. If it's less than 50%, then no idle fees in effect. If it's at least 50%, then yes, idle fees are in effect. That's it. There has been no change to that, and that has always been published on that site since they introduced the idle fees. And no, you don't need to go check every day, because it hasn't changed.
This is a separate issue of when Tesla started determining that some sites were high usage and moving people's charge limits down. They have never announced any kind of criteria for that, but they do have the notices in the cars when it happens. (The notices are usually reliable, but not perfect.)