No it is not necessary for clearing content. What they used it for is birdseye view shotcalling (aka moon POV) with a 9th or 10th player in call, the latter being not an issue but benefitting massively from the former.

Using Mount Ordealis EX as an example is poor imo. Even large size bosses such as Brute Justice dont even remotely need it. If you need more vision, move or turn your damn camera.

Let's NOT normalise highly frowned-upon 3rd party tools such as zoom hack as features because the top echelon of raiders insist having an arms race abiut it. If you give us that, what will be next to be demanded as a feature? Where will we draw the line in the sand?