I'm humbled that you liked it so much you lost track of time. Thank you, but also I'm very sorry lol
And also, sorry about Rosa and Stella! There just was no room for them in the plot. I mend that partially in Matters of Trust, where Rosa plays a far more prominent role. I hope you'll enjoy what I have planned for her.

As for your questions:
Answer 1: I answered a similar question from Gilogg a few weeks prior. To add onto that response, had I played Ending 4, I would probably not have felt the need to make LSS at all. I'd have been satisfied with the happy ending and moved on. It was a storm of perfect coincidences.
Answer 2: I wanted to come up with my own conclusions for the characters without seeing the canon best ending, motivated by seeing E3, then E2, then E1 in that order.








