if properly inputted, Gamechanger stats are very powerful tools. Or a big lump of crap. Spray charts, batting averages against same pitcher previously, % of QAB, # of pitches seen after 2 strikes, # pitches per at bat. Many stats that are damn near impossible to track with a standard book, but easily tracked with GC.
I can give several examples.
Runner on 3b, batter hits high fly to deep left field. caught for out, and runner at 3B tags and scores easily. Sac Fly all day. However, it needs to be entered as such in gamechanger or the batter gets short changed in their offensive stats.
passed ball versus wild pitch - pretty easy to see the pitcher versus catcher parent keeping these stats.
easy grounder to 3B, F5 scoops cleanly and throws a warp speed worm burner past 1B, ball bounces 2x before passing 1B. that's a throwing error of F5, not an E3.
As yocoach stated, GIGO.