Less weight would be better, but there's ways to embrace that and aleviate the issues ("have the product be true to its nature" to channel my inner Jony Ive).

This time Apple chose not to, while Varjo tends to care a lot more about these ergonomic aspects. Looking at the XR-4 strap, it looks like a solid design to me.

A motorbike helmet is heavier (3kg), but the weight is wrapped around your head, not hanging in front of it.

Yes, that's what makes the weight bearable.

Same way the Quest Pro for instance splits the weight around the head to achieve a good balance. Better bands will also help.

At this point we have none of that for the Vision Pro, which is a choice Apple made.