No need for laptop external monitor

Why do we need separate monitors for laptops? Because working on a laptop for a long time can cause strain on the neck as the screen is too low and too close. I suggest that rather than use a separate monitor, the laptop monitor can be extended away from the laptop based, probably with a multi-stage extensor to get sufficient distance. The screen would need to be light enough and the base heavy enough that it wouldn't tilt back, but given the weight of current laptops (and hence their screens) this seems plausible. If this is not possible then an extendable downwards support from the monitor would be needed.