The primary benefit over a Macbook Air is the full size 40% mechanical keyboard. Other advantages are hackability, smaller footprint, quicker access without having to open screen, more inconspicuous when using in public space.
But this is very much a "niche" device, if you are questioning if it would be useful, you almost certainly should get a general-purpose device like a macbook, instead.
But this is very much a "niche" device, if you are questioning if it would be useful, you almost certainly should get a general-purpose device like a macbook, instead.