I bow to your superior knowledge, but the train I was on did all of this at 18:10 on a weekday - presumably a peak commuting time.
The train was just not timetabled as such and all 4 carriages were all but empty.
What is surprising is that there isn't any form of Falmer (or Lewes) to Littlehampton service either before games or after, particularly midweek.
I didn't think such a thing was possible until, last night, my Hove - Brighton train then became a Brighton - Falmer/Lewes service leaving from...
I can understand how a one-off visitor, particularly one who has done no research, may think it poor but for regular visitors I think it's fine - I certainly have no issue with it. It's trains most of the time for me, although I've used the Uni and Bridge car parks on a few occasions.
(It did...