Focusing on truth rather than status in a conversation tends to save time with respect to the goal of truth.

Those two aren't the only possible ways of having a discussion. There a lot more that goes into having discussions.

Communicating why you believe A is different from communicating why it makes sense for other people to believe A. However, if the two are very different, something has gone wrong:

Not at all.

At the LW-Europe Community camp I did a workshop on Focusing. There are two ways to provide evidence that Focusing works.

I personally choose mental techniques based on trying different techniques and experiencing what the techniques do. I can speak about my empiric personal experience.

I can also refer to Eugine Gendlin being a respected academic psychologist and the fact that there are many published studies that support Focusing.

Both arguments are entangled with reality but it's more useful to talk about the scientific evidence. It's more likely to convince my audience that Focusing is valuable.