You absolutely do not understand what rendering in HS is. Yes, the process of obtaining the final image is very fast (fractions of a second), but preparation for it takes a lot of time. You need to set up characters, props on the stage, for the characters you need to set the pose (a fucking difficult process if you want the pose to look natural), pick up lighting and set the angle. In addition, the HS studio interface can hardly be called user-friendly (especially for fine-tuning). All this takes hours, and if in addition it is also a new location, the time increases many times.
For DAZ or Blender it is also relevant - rendering on modern GPUs takes very little time, and the time spent on scene preparation and adjustment far exceeds the time spent on rendering itself in any editors.
So stop bitching about it.