The advantages of packing light aren't always obvious[1] until you experience them, so you can pretty much tell someone's level of travel experience by how small their luggage is. I've yet to meet someone who packs more and more stuff based on past experience.
As the article mentions, good fabrics (like merino wool) can go a long way.
(1) Reliability and flexibility being foremost. Not having to worry about lost luggage. Itinerary changes are much easier when all your stuff is with you and can fit on your lap or under your seat. Then comes the comfort and speed. Being able to take the stairs or not blinking an eye at walking an extra half mile go a long way towards making travel enjoyable.
As the article mentions, good fabrics (like merino wool) can go a long way.
(1) Reliability and flexibility being foremost. Not having to worry about lost luggage. Itinerary changes are much easier when all your stuff is with you and can fit on your lap or under your seat. Then comes the comfort and speed. Being able to take the stairs or not blinking an eye at walking an extra half mile go a long way towards making travel enjoyable.