This is not a court of law and I am quite comfortable believing this was planned obsolescence for the simple that behaving in this way was advantageous to their profits. Otherwise it would not have taken lies (they initially denied the existence of the throttling!), outrage and lawsuits to do the right thing.
The alternative explanation is mass ignorance and/or incompetence on a level that would be hard to accept coming from Apple. Am I expected to seriously believe that nobody at Apple tested this throttle down behavior and saw (and likely measured) the impact on day-to-day performance?
One may say it’s the layers of transparency and other services, but I don’t care about those, my Macbook 2013 was the pinnacle of perfection.
Apple is still definitely slowing down Macs with every single little release.
This was true for Intel Macs 2014-2020. I bought a 14' M1 Macbook Pro with 32GB of memory / 1TB storage and it absolutely flies. Best machine I've owned in almost a decade (2014 15' MBP).
We also know that Apple is stubborn (see the removal of the headphone jack), so of course it's going to take a lawsuit for them to reverse course on something like this.
Apple decided to underclock CPUs when the battery had aged to the point where consistent voltage couldn't be applied at maximum power. They did this so users wouldn't complain about their phone randomly crashing. Really, they were damned if they did and damned if they didn't.
What you can criticize is that they did it without informing users or allowing an option — the lawsuit and backlash reversed that course and they now have a setting for it. You can argue they should have had that all along. You can argue they were doing it purposely for planned obsolescence, but the evidence isn't really there to support it.
Apple provides major software upgrades for years longer than most Android devices do. There are some exceptions for Android, but the rule is that you're lucky to get more than two years of software updates for your phone. Apple, on the other hand, supports for 4-6 years. That should earn them kudos compared to most Android manufacturers.