Losing the debate round to a better argument is how you learn what a better argument sounds like.

You cannot recognise a standard you have never met. Losing to something genuinely better gives you the shape of it: the structure, the evidence, the move you had not thought of, delivered in a way you will remember because it cost you. That is unavailable from winning and nearly unavailable from reading about it.

After the next loss like that, write down the one argument you could not answer, as close to word for word as you can manage. Then work out the answer in your own time. Keep a list of those across a year and the same thing will not beat you twice.