Well, let’s look at it from a different angle; not the angle of the user or the developer, but as a matter of computational work and the energy consumed by that

Well, let’s look at it from a different angle; not the angle of the user or the developer, but as a matter of computational work and the energy consumed by that work. In a single application or even the life of an application all it might be negligible. But when does it not become negligible? What if react adopted the change and every react app What about for every react app in use suddenly used a fraction less computational power each render? And is it just a monetary cost? Yes, if energy use is your primary concern there are easier ways to reduce it. But in the above context it seems clear that you should take your gains where you can get them.