This is so dumb. Apple has a lot of flaws but old hardware support certainly isn’t one of them. Firstly, they only slowed down older phones to prevent them from crashing as they had less and less reliable battery draw. Secondly, Apple’s support for legacy phone hardware is the best in the market. It’s absurd that they’re being punished for this.
If their intent was customer happiness, they would have notified. But they didn't, and there was a lot of upgrade money to be had.