No, it's better. Retaining identity is _easier_ with such a system.
You mark in the DOM where the expressions are, and on updates instead of a vdom diff you check if the template rendering to a DOM location is the same as before. If it is then you just update the expressions. All the unchanged elements stay the same, and sine you don't traverse the DOM or a VDOM, the update is much faster.
You mark in the DOM where the expressions are, and on updates instead of a vdom diff you check if the template rendering to a DOM location is the same as before. If it is then you just update the expressions. All the unchanged elements stay the same, and sine you don't traverse the DOM or a VDOM, the update is much faster.