Why from scratch? You don't have to go through the whole game again. You can skip all the quests from the previous update and continue playing the new quests. It is enough to start the "New Game +" mode.
We cannot fully implement loading from OLD saves. The reason is that we are changing mechanics. And this leads to the fact that the gameplay changes in the game. This means that you cannot load old saves, because these saves do not contain new mechanics.
If you want to play NEW content - I wrote above what to do :3 You don't need to go through the same thing 10 times.