If you look at external view in some planes you can see throttle %. If you push A or B quickly you can see it move 1% at a time. Hold it longer and it will start to move alot and quickly. I think it’s just the nature of using an analog button to control it. Also on planes with reverse thrust you have to be careful when just trying to cut throttle, or you end up activating reverse. But watching it move 1% at a time will give you a better feel for how it’s working, and allow you to adjust it more precisely.