You know that if you use the shift key and your wheel pressed.
As soon as you have a double arrow that appears, you can release Shift.
However, the wheel must be held down as long as you zoom in or out.
With this layout, you can zoom in at any speed you want and even continuously vary the speed.
This way, your mouse settings are not changed for any other use on your Machine. Indeed the needs are very different depending on what you do in SW and if you do basic office automation ;-)