Sequels and reboots are hardly a new concept and have been a part of Hollywood culture since the 1930s. The success of the Universal Horror movies from that era being a prime example of direct follow ups and retconned movies. However, there is one fundamental rule that distinguishes a good sequel from a bad one. You should never mitigate, undermine or make irrelevant the events of the previous movie, just to provide your new film with a raison d'être. For example, the events of Aliens do not contradict or trivialise those that happened in Alien. In fact with that franchise there is a very clear logical progression between the two movies. The same is true for Mad Max and Mad Max 2 or Star Wars and The Empire Strikes Back. The key is to progress a story, enhance it or explore things from an alternative angle and bring something new to the cinematic table. Sadly this philosophy is all too often lost on corporate film making. Which means that many sequels are just tedious replays of prior films. Terminator: Dark Fate falls squarely into this category.