It was very dramatic. For one, it stopped being a physical, clickable trackpad and became a single piece of glass with haptic button pushes. Losing the physical components also gave more room to make it larger and it's gotten bigger since. You also got more multi-touch options. It was pretty big.

The haptic responses only began with the 2016 or 2017 models. You can tell when it's turned off if clicks or not. (I have a Mid 2014 from work)

It started with the 2015 MacBook Pro models, the last before the USB-C models.

>It was very dramatic. For one, it stopped being a physical, clickable trackpad and became a single piece of glass with haptic button pushes. Losing the physical components also gave more room to make it larger and it's gotten bigger since. You also got more multi-touch options. It was pretty big.

All of these are correct but have nothing / little to do with the quality of the main trackpad use experience, which was still great on Macs before it got haptic pushes, larger size, glass, etc.

We'll just have to agree to disagree. The experience was great on Macs before then but it was still a dramatic difference when this change happened because we got additional gestures, much more precise tracking, and a larger surface area with less friction than the previous models.