I don’t fully understand what this debate wants to achieve.
Said that my opinion is to not disable the scrolling gesture.
1 - you’re using google maps and on google maps this gesture is available, I don’t want to learn how to use a common tool like this
2 - from the interaction angle, I believe, but I don’t have any data to prove it, that is the easiest way to “zoom-in” and “zoom-out” the map
May I ask you what is the added value of removing the gesture?
Let us know how the debate ended!