Rogues probably aren't THAT
Functionally speaking, there's only two things that really keep Rogue held back from the rest of the classes, and it's mostly because of how their subclass features are forcefully spread out.
Moving the 9th level feature to 6th level and giving them a basic Extra Attack would pretty much solve their feature starvation and lack of combat strength.
This would basically super-buff all 4 of the listed rogue subclasses(I think Scion of the Three is rather lame feature-wise) due to the nature of their different abilities at 9th being balanced for that level.
EDIT: That bad*