We chat about videogames and videogame accessories.

There are essentially three endings in undertale, two for committing entirely to the paths of "killing everyone" and "sparing everyone", and one for hitting somewhere between that (it can be hard to spare everyone the first time round!).
The bit that I imagine Solaris is referencing is that post the "middle" ending, you get a phone call from a character who will always survive the ending, who gives you a kind of epilogue of "what happened after the conclusion", which changes based on what you did previously.

It isn't much, but I agree with Solaris in that even just a very short monologue about what happened to all the other characters after you got your conclusion is all you need to make prior choices before the "pick your red, green, or blue ending" final decision seem less pointless.


Of course this wouldn't work in Life is Strange, given that you get to either pick to save your romantic partner and let everyone else die, meaning there is nobody to monologue about, or save literally everyone else by undoing all of your previous choices, meaning that they actually were meaningless. Oops!