Assistive Touch now has Quick Actions will allow you to respond to Apple Watch alerts with hand gestures. Quick Actions can be useful to just about anybody. For example, if your hands are occupied, you can use this gesture called 'double pinch" with your watch hand to answer or end a phone call. If this is something you don't think you will want to use then you would just turn it off in your settings. You can also set it to only be used while assistive touch is enabled.