Sure. A lot of people thought when Apple removed the headphone jack that it would make room for a bigger battery, specifically. But Apple didn't use the space that way. They put the Taptic Engine there instead. The bigger Taptic engine on e.g. an iPhone 8 vs. 6 is used for two things:
1) 7/8 series have a home button that doesn't actually push. The Taptic Engine mimics the feel of a button push.
The iPhone 6 battery is 1810mAh, whereas the 8 is 1821mAh. So they didn't increase the battery size; they added the Taptic Engine instead, and got rid of the mechanical home button.
Articles gush about the Taptic Engine, but I'd still rather have my headphone jack back. And I liked the clicky home buttons.
1) 7/8 series have a home button that doesn't actually push. The Taptic Engine mimics the feel of a button push.
2) It allows for different types of vibration, e.g. when hitting the corner of the screen while dragging or for more subtle notifications. (https://www.androidcentral.com/its-2018-and-android-phones-s...)
The iPhone 6 battery is 1810mAh, whereas the 8 is 1821mAh. So they didn't increase the battery size; they added the Taptic Engine instead, and got rid of the mechanical home button.
Articles gush about the Taptic Engine, but I'd still rather have my headphone jack back. And I liked the clicky home buttons.