Yes, the centre in plan but not the centre of the volume… In most cases these things are sat on a surface so the centre of the back face/floor of the bounding box would be handy. Otherwise it’s centred and then moved in the z axis to the right spot on the surface it sat on which becomes another couple of mouse clicks.
Same with 3D printing, most things are sat on the base plate etc…
By the time I’ve created the text and created a bounding box to centre each group and then a bounding box to that group (easier than volume centroid) it’s quite a lot of mouse clicks but this solves that.
If we could type multiline text and align it too, that would be a really helpful addition to WIP 6.