This reminds of "Argue well by losing" [1]. The purpose of debate shouldn't be to win or lose, but to reach consensus.
In addition, the ancients of the classical world regarded "Rhetoric" (ie the ability to debate) as being the highest form of intelligence. It required not only a deep understanding of the reasoning behind your own opinion but also an equally deep understanding of that of your collocutors. Ie, you should be able to argue in favour of his/her point as well as your own, and as well as he/she can. That takes wisdom and humility that most today seem to lack.
In addition, the ancients of the classical world regarded "Rhetoric" (ie the ability to debate) as being the highest form of intelligence. It required not only a deep understanding of the reasoning behind your own opinion but also an equally deep understanding of that of your collocutors. Ie, you should be able to argue in favour of his/her point as well as your own, and as well as he/she can. That takes wisdom and humility that most today seem to lack.
[1] - https://haacked.com/archive/2013/10/21/argue-well-by-losing....