With the nika fruit introduced and how much of a bigger deal it is (saying bigger deal might sound stupid and would not be enough)
Yet Gorosei/WG never even try.........or put effort in hunting down Luffy or his entire crew during pre-skip, it's not like Luffy is hiding, dude is choosing whatever island he wanted to go with no one stopping (and all are WG territories)and cause chaos one after another
Knowing that even Smoker alone could have deal with all the crew during those time, the WG never give a damn about Luffy which is the worst writing and is popularly overlooked in the fandom.
One could defend that it's because of plot armor, but Oda never give any reason, explanation or excuse (even a lame one) on this issue. The SBS questioners should ask this one. We need at least a reasoning even if it's a shitty excuse