WAAAY too lenient.
This is typical Apple bullshit. Whether it's nefarious or not, it's certainly consistent with their mania for hiding critical information from the user. They've implemented logic to detect a compromised battery... THEN THEY DON'T ALERT THE USER. There's no excuse for it.
Instead, they implement an overly complicated workaround that doesn't actually fix the problem. But... what is the real problem here? Apple may be lying about the rationale in the first place.
They claim they're trying to prevent random shutdowns, but those shutdowns were happening on relatively new phones too. The fact is that they probably never figured out what was causing the shutdowns, so they're throttling performance as a workaround in situations that seem to be correlated with them.
Another embarrassment for Apple is that they're contributing to this problem with their idiotic campaign of ever-smaller battery volume. The "thinness" excuse is long-played-out and just insulting at this point; not to mention that the iPhone is an ergonomic failure for being TOO thin anyway.
Maybe the problem is a defective thermal sensor. Search for "iMac randomly sleeps" or shuts down; Apple is telling people that this is a defective thermal sensor on the logic board and charging $600 to fix three-year-old top-of-the-line computers that are now useless.
It's time for everyone to face the fact that Apple is now peddling schlocky merchandise. Glued-together computers with soldered-in RAM, asinine gimmicks like the "touch bar," music-centric phones with no headphone jacks...
What does a company have to do to drive customers away? Apple seems to be exploring as many options as they can.