My first Apple product was a iPad Pro I got last year. I consider myself quite tech savvy, but the gestures was a huge pain-point when learning the device, to the point that it soured the whole experience for me:

When trying to find the WiFi toggle button (which is accomplished by "pinching" the screen) I basically just tried every possible gesture until I found the right one (I know that some gesture opened it from watching others). By far the worst and most memorable UX problem of the year.