Why not offer the ability for customized PR results? I'm training for my fastest mile at the moment, so I'd like to see my 100m, 200m, 400m, 800, and 1600m PRs (from training workouts...not within the mile itself). In the past, I've also run 50km baby ultras, so why not offer the ability to add any distance at all for which we want to track PRs?
I see many similar feature requests from 8-10 years ago. Why still not available? Seems simple. I can understand limiting the list for what Garmin analyzes and pools data for comparison between athletes, but I want access to this data even if I'm the only one seeing or benefiting from it.
Additionally, you should be able to drill in on the PR screen to see your other attempts and be able to sort by date, time, or any other number of data fields (though those are the two that I would use).
Like others have mentioned before, there are certain courses that I run often...we should have the ability to drill into the course and see the history of doing the activity on that course and the ability to sort by date, time, or other data fields. If I can easily see my fastest time on a course, I can create a PacePro plan that takes a minute off of the total time for example.