Optimisation allows for more content for one thing and let's be honest, most of the variants in this game are barely seen as it tries to randomly pick them due to how the tags work. Same goes for others, it's a lot more obvious in ren'py etc though where the devs are leaving files in at sizes you will never see them unless you rip them out of the files due to the sizes they set them to display at.
You'll want to check running into the single girl in the forest, when you go through her options sometimes when you use talk it acts like you've already captured her and you lose the capture option when you go back.
Yep. Already repoted that capture issue and will be fixed for 0.27.
As for talking with unknown person and she talks like she knows you - also already in todo list. Plan at one point if regarding personality, etc create a different talk branches
As for optimisation - You mentioned audio samples BUT right no videos are only 25% of the size.
I had idea that maybe some one time events could be replaced with webp files, instead of mp4, but for now I see that I could get maybe 50-100Mbs max on that.
I agree that game needs to be optimized but I don't see anymore where I could do that.
One would be to cut videos shorter but created a vote for supporters and they don't actually care and I'll probably stick with mp4 files with length 15-20seconds max