The balance idea never made a lot of sense considering that anyone at any time might choose to become a dark Jedi. The hubris of the old council overlooking the rise of Palpatine had to happen somehow of course, but the PT just feels contrived and makes them look like a bunch of old stoners (even before all those parodies). Beyond all that Chosen One plots are just the worst. TLJ at least did a reasonable job of look at the golden age with a sceptical eye, but even mentioning that period or any PT stuff was probably a mistake. At least the ST did something with the idea that the Force is just a natural energy field that exists in weird evil trees, creepy basements, sea caves, or whatever.