It's a logical assumption and the battery is not head mounted.

Quest Pro weights 722g while MacBook Air 15 weights 1.5kg. How can you expect it's twice heavier than Quest? It's completely unacceptable for most people's head.

The poor ergonomics of laptops are unrelated to their weight.

The last bullet point in GC's comment was related to weight.

Hmm, I guess you could take it that way. But things that light only really get tiring if the weight is poorly distributed. It's more about the size and sort of bag it's likely to be in.