Just an opinion for an answer, and from someone who has never had a 3D gimbal.
I think a 3D gimbal is extra cost, weight, fragility, and complexity over a 2D (no yaw) gimbal. I am guessing that a professional crew often uses 2 people with a 3D gimbal, one to fly and one to frame the picture with the gimbal and record.
There are flight modes in LP and other brands that make yaw gimballing less required than is first assumed.