Very well written and intelligent replies by everyone here. So many fascinating takes, all with a slightly different perspective.

I’ll give mine:

I never had any experience with the RPGs, I played the SNES games “Super Star Wars, Super ESB, Super ROTJ” and they actually just went by the movie plots, and were very difficult but extremely fun. The EU, which OP doesn’t explicitly cover, also demystified the saga in a way I found off putting at times.

However, how can something that’s so popular and mainstream remain mysterious, unexplored and tantalizing forever? It’s a tricky question but I think the most installments took away some of the “mystery” of Star Wars starting with ROTJ. The prequels did a far better job at expanding the galaxy than Disney has. The last Jedi felt like a high school football game in its conflict.

While a natural conclusion, the series has reached a point of massive over saturation and fatigue. It no longer feels sacred nor special.

To OPs second point about the familial reveal. This was actually a surprise because Lukes father was supposedly killed years earlier. It’s revealed he became Darth Vader and now serves the emperor. OP is spot on here, as the this has been entirely misinterpreted to mean the whole saga is about having hidden lineage and JJ Abrams entirely convoluted this into a constant tease of who Rey’s parents are. Luke’s father only became important after the reveal, and it was never implied he had a mysterious or secret parent. So, as an audience, we’re genuinely surprised in ESB. But as movie makers and content creators, teasing the issue of hidden family that is powerful does the opposite; it sets us up for something that is an twist and ends up being stale.

TLDR:

Mystery is hard to maintain and Star Wars has been misinterpreted to be about secret family relations, which was a one trick pony that has dried up.