Yes my desktop functions as a NAS - It takes maybe $100 more to get from a synology NAS to a working desktop-cum-NAS-cum-plex-server which I have.
On the other hand, it takes $500+ more to buy a laptop to plug in to a nas.
My point is, a laptop isnt always better.
You're missing the point. This is about quality of life, not pure value for money. No, a laptop isn't always better, but it sure is a lot more flexible.