Thanks for the thoughtful responses, to give you credit it does seem like George doesn’t really agree with himself sometimes when it comes to the nature of the force, nevertheless I want to focus on how the concept of “balance in the force” is depicted in the overarching story of the original 6 films in relation to the Disney films.

In the prequels The Jedi were at the height of their power yet the force was in a state of imbalance, this was due to the Sith rule of two who used the darkside and worked in the shadows, weakening the jedi and clouding their judgement. Enter the Chosen One and long story short he destroys the Sith and brings balance to the force, the Jedi live on. Now if we are to talk about about “balance” (a prequel innovation) than we cannot escape the prophecy of the the chosen one - the concept of balance exists primarily to compliment the prophecy.

When you look at the overarching story of the 6 film saga the relationship between the light and dark is clearly depicted as anti-symbiotic, contrary to the ying yang, dark and light as two halves of one coin spiel in TLJ, we see that when the force is in balance the darkside (while always there) has an alluring presence on the periphery of the Light(what the force mostly consists of), the imbalance happens when the darkside is used excessively like when the sith are on a power trip hence poisoning the well, when the sith were destroyed the power of the darkside diminished back to the periphery of the spectrum- bringing the force back into balance.