It's nice to see old laptops get a new lease on life this way, but it's hard to deny the compromises that come with such an approach. As nice as the old 12-inch Powerbooks/iBooks, T60s, etc were, they leave a lot to be desired by modern standards.
This brings me to wonder how difficult it would be to develop a notebook that is specifically designed to be a focused offline ultraportable, using the most power efficient and cost effective components available along with an extremely lightweight, nearly nonexistent OS (think classic Mac OS) with some modern affordances and high-end touches (USB-C charging, milled single piece enclosure, etc). The imagined result is a machine that costs less than a decent Chromebook while being more responsive, having dramatically better battery life, and being generally more pleasant to use.