I don't disagree with this. But I'm more inclined to agree with
@rhino4evr - that a Lando movie with a Han cameo would have been more captivating- but even that isn't that intriguing. Of all the characters in this movie- The story of the Falcon before it got to Han would've been more captivating to me.
The whole story of Han Solo is just unnecessary. This isn't Marvel Universe- we don't need to know, nor care about Leah's upbringing like we do Black Panther- because it isn't going anywhere; whereas BP advances the MCU.
What made Rogue One the best Star Wars movie to date (as a film), is that it was a completely separate environment, characters and story. Characters they could craft and give unique backstories to.
Hell, the fact your 2nd sentence is "I just don't think Han Solo is that unique of a character" is all the evidence we need.