Well, I can't speak to Apple's intentions, but consider they did the same thing with their laptop touchpads as they did the iPhone button. The touchpad used to actually depress, now it just vibrates to simulate feedback.
(Thinking about this again, past the edit window—no, it's more than three parts. There's the (1) sleep/wake button, (2) (3) the two volume buttons, (4) and the vibration motor. And I guess (5) the speaker too, not sure if it counts. Still, it's not many.)
Yes, and it's one of, what, three moving parts left? Even the home button on the iPhone 7, 8, and 2020 SE is fake, it doesn't actually depress.