Personally I enjoy being able to just look up a leaderboard and see from the various submissions, which characters seems to be most commonly used in the top to get an idea of what can compete well. Without having to look up individual submissions just to check what people run.

Example:

https://www.speedrun.com/mk11

Yah its a nice addition to leaderboards. Although MKX only has 1 viable character for Speedrunning Arcades. Blood God Kotal Kahn.