Sniffle* So this is the end of the main story line? What a great way to end it. Some crazy philosophical stuff that doesn't end up being too pretentious. It ran very close to "moral of the day" but it did manage to avoid that.
Episode 3 left with one of the most difficult decisions in the series. Is it really ok to be selfish and go back to the world you wanted for at the cost of others? As Rika makes her decison, she begins to realize that Hanyuu was always there to help make her decisons. But this one, she must take responsibility, and take the risk of commuting a sin. Indeed, since Rika has spent the series as the innocent one, this totally flips the series over, as this entire arc already has.
But it is the hard choices that make the person and we are all the sum of our experiences, even if we don't want to be. It's just not a good idea to be constantly pursuing what-ifs constantly. Only with this realization, only can they truly move on with their lives and this is truly the end of Higurashi.
10/10 for adding more insight to an already fascinating story.