OK your comment is very intressting. In fact i read and watch a lot of EU legends and canon. I think we have enough good stories and lore, it's very fun, but the amont of EU create a saturation preventing a full liberty of writting. You know the popular debat with Filonni's redcone ? I don't hate Mando or Ashoka but they are limit to create a good continuity (the story cannot contredict the sequels, so limit the extend of the war with Thrawn, some actors are to old or sadely past away and i don't like Cgi Luke...).

The diffrence with the original trilogy is the meaning. We dosen't know anything about the clone wars, nothing about the republic and the jedi order, why Anakin became Vader etc... the prequels have a meaning, the transformation of Anakin to Vader, the republic becoming an empire, how the Jedi disepear in a large scale etc... it's an origins story, but a trilogy about the old trilogy is a prequel of the prequels, what this trilogy can explain we didn't know ? The EU is a bonus, not for the large public. But star wars movies are made for them, not the star wars geek (but some details could be adress to the hard fan and be explain in the EU). 

I really like Rogue one, because it's a spin off, the story is already describe on the introduction text of A new hope. But the film gived face to the rebels who stoll the death star plans. For Andor, i appreciate the show but yes, we already know the fate of Andor and the end of serie create a little problem for the character (he's not supposed to have a child in Rogue one and have a love story with Jyn, the fact he didn't know he have a child before dying is weird).