I've been that person who's been self conscious of my running ability, I used to look at the previous year's race results to see would be last if I ran and I've chosen not to run races because I had visions of being miles behind everyone else, convinced they would forget I was still out on the course and pack up to go home! Silly I know but genuinely that was my thought process. Even when I started parkrun many years ago I was sometimes mindful of being "one of the last" - this was before tail walker was mandatory. And parkrun have addressed this since by introducing the tail walker and park walker roles.
Parkrun can't be everything to everyone. Things like first finishers, course records, age grading - meant nothing to me when I started out in parkrun, and still don't interest me that much. But they are important to some people. I actually find the first finisher's page interesting at times - sometimes we have father/ daughter or mother/son first finishers or first finishers who are a couple.