To put it in the user´s appData IS one of the problems when moving the game from one pc to annother. What would be optimal is the ability to put the games saves and all on a usb drive, so it can be played on any win7-win10 pc and not need to start over but to continue seamlessly. In what way is the user´s appData a better choise and or more convenient for the players?
The game originally had the save files inside the game folder but because of popular demand it was put into the persistant save location windows+r and type in %localappdata%, and there you have the VNGINE folder with all the saves.
I designed the save and load system from scratch and it had a Unconditional Love_Data/Saves folder before.
People were complaining that they deleted the game folder between every version and the save files dissapeared. Even ren'py saves their files to %LocalAppData%, however they have a copy inside the game folders. I opted out for the copy because people were already confused enough with having multiple ways of doing things. It was the fans decisions to have it the way it is now. This has been a discussion for months if you just go back and look in the history from a year and a half or two years ago.
It's not much work for you to go in your pc, write %localappdata% copy the vngine folder, and take that with you to your other pc. It's actually faster to do this and get saves for both chapter 1 and chapter 2 rather than having to go into each individual folder, if you already have the game clients on the other pc...