Anakin defeated Dooku as well IIRC as well in AoTC.
That is a good point, Anakin did not fight Darth Maul either. Wow it seems like young untrained Force users have a history of not going up against Dark Jedi. Remember when Anakin was killed by the Younglings? Nah, me neither.
The one main tweak I would have made is Rey losing to Kylo or giving her a tweaked back story (which I think she needs anyway).
If Kylo is loosly based off Jacen Solo in Legends I would have based her off Jaina maybe Mara Jade. Luke was fairly restrained in most of the legends material but they weren't allowed to kill him off and they often sidestepped around his powers either with force dampening creatures, star, or he retreated into the back ground due to iot wasn't his destiny to kill Jacen (and he feared falling to the darkside).
Luke got a dark side point in ESB and RoTJ in RPG terms, they played up the temptation.
Rey could have met Ahsoka Tano in TFA and then got the trained by Luke T-shirt in TLJ. They don't need a massive amount of world building IMHO but something would be nice. I owuld have used as female protagonist myself for the simple reason its something we hadn't seen before. The female Jedi were back ground characters for the most part, legends was full of them (and Sith Ladies). Its one thing Legends did better IMHO than even the prequels.
I have a post Endor game and I'll have a Sith Sisterhood via a secret apprentice of Darth Maul before Obi Wan Killed him. I'll let the PCs defeat 2 of them but the rule of two will no longer apply so the master is still out there. They had a Brotherhood of Darkness, the men keep failing (including the rule of two). I'll borrow the One Sith idea from legacy and tweak it.
Mara Jade was a cool character.