Zero replayability? I will replay this at least once to check out different choices.
On the episode: loved it, though I don't know about me ending yet..My favourite character Vince didn't go to the camp and if that is important for season 2, I need him there!
The goal isn't to get everyone to come with you. I mean... if that's the goal you want for yourself, and you want to play through a couple times to optimize for that, then good on you, but the game isn't going to declare you a winner or a loser for doing it. As far as "the point," we aren't saying what the point is, beyond "your choices told an interesting story," but your playthrough of season two isn't going to be objectively better or worse depending on what happens at the end of your playthrough, it will just be different.* This isn't "what the secret is" or something (I am literally just making this up as I write right now as an example to use) but just
consider that within the confines of 400 Days you don't have any metrics by which to judge if going with Tavia is a good idea or not, other than you're playing as her for a minute.
* Remember, this is the Walking Dead game we're talking about here...