TFA was literally built on elements solely from ANH & ESB.
Sigh, I wish that were so. There were still a few WTF moments in TFA, where I was taken out of the film by some prequelism. The mention of “clones” as something that actually might still happen as opposed to ancient history, and the mention of “Sith” as if we were supposed to know what the heck that was. Then for Jedi references, there’s Vader’s melted mask, for example. There were also some more buried prequelisms, such as prequel flags, etc, but yes the larger point is that is was almost exclusively OOT or original elements, which certainly helped it immensely. You could argue that “clones” was an OOT element that was just bizarrely anachronistic, and that “Sith” was a reference to OOT source materials and EU stuff that predates the prequels, but nevertheless they felt off to me (and they were both completely frivolous to the plot and should have been excluded to avoid WTF reactions).