John Stott was scrupulous in attempting to do this. It was a key element of the respect that he garnered amongst those he debated or disagreed.

The problem with doing this, of course, is that it is labour intensive. It requires far greater research than, for example, a knee-jerk reaction that latches onto a line that seems dubious or dangerous. Which is probably why it is so rare.
It is the antithesis of soundbite politics and twitter disputes. In fact, I’d go so far as to say that it is the opposite of contemporary debate full-stop. Everybody is so siloed in their own echo-chambers that they have no need to make the effort to understand, let alone be understood.

The emergence of the image-manager in the political arena and the concomitant decline of the speech writer attest to the fact that television demands a different kind of content from other media. You cannot do political philosophy on television. Its form works against the content. (p7)
So it is with Twitter and Facebook. I simply don’t believe they can ever be useful platforms for fostering civility in debate (not unless some major adjustments are made, for which I completely lack the creative intelligence to imagine what they might be).
Please note, however, that I’m not talking about the ability to summarise in a pithy way. Stott was himself the master of the succinct summary statement that sparkled with crystal clarity. I suspect he would have been a master of twitter, actually. What I’m on about is the issue of how we dispute and debate.
In short, we need to learn this vital discipline.
We should summarise others’ positions as they would wish to have them summarised.