JohnT writes:

I think that quite a few of the people who have read your postings over the
past few years have a good idea of the extent of your knowledge.

No more than I do of theirs. I can recognize many mistakes when I see them,
but that doesn't necessarily indicate the extent of a person's knowledge. In
some cases, you can tell; in other cases, you cannot.

Most people I interact with here are only interested in talking about me,
which makes it difficult to assess their knowledge unless they get something
clearly wrong. They do make some impressive claims, but claims in cyberspace
are nothing but background noise.

My own view is that you know a little about a lot of subjects, which
is dangerous.

Some people flying know only a little about the subject, too, which is far
more dangerous.