So I played this and only did a quick run through. This full "rework" is still the old 0.5 with the 0.6 being the rework.
This fixes some mistakes and what not and adds the extra scenes in game.
So not sure what exactly has been changed that would require a full start over.
However just for the people who don't know, if you started over now, when the next update comes, if it is the 0.6 part 2 full rework or straight up 0.7.
You will have to start over again. Keep that in mind. From what I remember ( that is if I remember it correctly ) the full rework was going to contain the new reworked characters and a somewhat different start.
So either you wait for that or be ready to start over again. You have been warned.
Also for in case you are going to ask when is that next update going to be, it is going to happen AFTER Summers Gone,
Which I btw have no idea when the update for that is going to happen and when it does is when we get the release ( in 2 parts I think ). So give or take expect something around October at the earliest ( Unless something happens and some new idea's pop up that must happen and be included which in turn means next year somewhere ). Now Enjoy.
PS: Loving the new Miru and Helen Models. ( not that I disliked the old ones )