Laptops have key advantage over ultra small form factor PCs (e.g. NUC) that they are fully self-contained computers that could be used anywhere without any other component. For many people, such advantage can be more important than other disadvantages.

This is clearly not true for this kind of keyboard computers, they require monitor a and power like ultra small form factor PCs or other desktop PCs. So my point is that i do not see any advantage for them to outweight disadvantages of such setup.