I think this is a reasonable stance.It is one thing to assume someone is arguing in good faith. It is a different thing to assume someone has a sufficient understanding of the subject to the extent that their opinions are beyond questioning. I will question a persons understanding, I will question the quality of their source, I will question their understanding of that source. Mistrust, is a good thing.
I think is valid to ask someone for their source so that you can see where they get their information from.
That said, mistrust also exists on a spectrum from not enough to way too much. I feel that RF is not at the sweet spot. I think we're a little too mistrusting. One thing I notice is that we do get reputations. In the last few months I've heard several times, more or less:
"icehorse you're usually so thoughtful, why are you so screwed up on gender affirming care"? I know I give some posters more cred going in than others.