How so? The MacBook will end up replacing the Air, the MacBook is better in almost every way (I believe the Air has longer battery life)
MacBook has a much better display it’s also thinner lighter and more up to date than the Air. I think Apple should introduce a bigger 14” version tho.
To each his own, of course, but I would add to your list of battery life, a decent keyboard, two ports.
Yes, the MacBook could be better, Apple just needs to get over the thinness fetish. More battery life and a reliable, good keyboard are more important than a couple of mm on a spec sheet.