Idk TOS had iconic characters that could be reprised, because the character was so strong.
TNG was focused more on the story and the setting, which you can do with any cast. Also the most iconic character was Data and I'm not sure any retake on that character (because there has to be some variation) would work well.
One side is happy and gleeful to burn it all down. And the other side is beholden to not burning it all down.