I Feel like R6D1 is easier than R6C1

The>! big boss !<included, D1 was a walk in the park thanks to the sheer number of checkpoint doors thrown at me and my stack. C1 was extremely difficult for us though because of the final ascending, moving team scan that you have to do. Mostly because the team coordination you have to have is tremendous: you have to watch for where enemies are coming from, stay inside the zone, and check your fire for a long time.

For reference, my team cleared the last 3 checkpoints and the final "objective" in a single try, while C1's scan took us 4 attempts. How many people found this to be the case as well?