Also, the flaw wasn’t the exhaust port, it was the volatile reactor.
Bingo. He made the volatile reactor, the rebels had to figure out a way to actually get to it and blow it up, and the only way they could find required the budding space wizard to pull off an impossibly hard task that nobody else could. Doesn’t contradict or diminish Star Wars in any way, imo.
As for other stuff like the inconsistency of Vader at the end of R1 vs beginning of SW… Eh. I can see why it rubs some people the wrong way but it doesn’t bother me.
In rogue One, it’s the heat of battle at the end of a completely unanticipated sneak attack. Vader is in a desperate search to stop those plans from being stolen and it’s likely he told his troops to split up and search everywhere while he does the same. Whether it be luck or the Force, he finds them first and acts rather than waiting for his troops to gather. And it’s not CERTAIN he knows those guys have the plans on that disc or even sees the disc. I think arguments could be made either way and I’m willing to go with the idea that he doesn’t know about the disc and that he’s trying to wade through the rebels to get to the Tantive IV where he believes the plans are.
Once we see him in SW, they’re no longer in the frantic battle at Scariff. They’ve caught their prey who have no chance of escape. They can plan their assault accordingly so Vader sends in his Stormtroopers to do the dirty work and then he strolls in calmly to oversee the mopping up. It’s the difference between a desperate reaction to a sneak attack and the calm & deliberate capture of helpless prey.