People raise an issue, others react instantly, but people often don't think things through very much. I find myself doing the same thing with a digital phone in my hands. Another argument is that digital technology doesn't extend the body so much as leave it behind. The most superficial evidence of this is the almost constant failure of cyber citizens to catch humor or sarcasm or understatement or depression, those important emotional textual communications that aren't explicitly said but have as much importance as what is literally said. In my view, these are reasonable objections, but rather like pissing in the wind.
Technology has a kind of autonomy about it.
It demands our participation, no matter how reluctant we are. The digital presence we individually create is a new form of embodiment, not just the end of the body, and we will have to find new ways of being digital and human at once. Of course, there is an entire genre of sci-fi that theorizes that the digital body may be our salvation on a planet that will become too toxic for present life forms. In this view, technology calls us on behalf of our own salvation, not to end meaningful relational lives. I'm not sure.