Those are interesting questions, but unfortunately you have basically ignored two of the three questions I asked you.

I figured the answers to those were easy to extrapolate from what I wrote, in any case here they are.

Do you agree that in litigation there is a much more of a problem of extraneous factors making it difficult to assess the lawyer than extraneous factors in auto repair making it difficult to assess the mechanic?

I agree that this is more of a problem for lawyers, although I'm not sure how much more.

Do you agree there are also problems with doctors spending energy on signalling, (although perhaps not as bad as with lawyers), for example, caring about where a doctor went to medical school; prestigious internships; and spending money on impressive facilities?

It is, but I've never heard anyone say that there is no point going to anything besides the top tier medical schools.