That speech only helps my point that in ANH Leia's original mission was to get Kenobi and the plans fell into her lap later once she was already on-route.
Well, she probably gambled on the ship not having been identified.
That only makes sense if we assume she wasn't running to Tatooine because she was trying to avoid Vader i.e what appeared to be the case before this film came out.
But she also had to recover the Jedi on Tatooine because daddy said so if I remember correctly.
Which brings me back to my original point. Stopping off to pick up Kenobi was a massive, massive risk which nearly cost the rebellion its entire existence. Yeah it worked out well in the end but why would anyone sane do it? Why not deliver the plans first? Why was picking up Kenobi so important that it was worth the risk?
In ANH the reason why she continues the mission makes sense, the transmissions were intercepted once she was already near Tatooine and she continued trying to get Kenobi cause it was the only way to save the plans once the Empire started chasing her. But with the addition of Rogue One it now seems that she decided even at the battle to head to Tatooine, and that simply doesn't make sense to me.