Taliban were protecting Bin Laden, period. Their official stance on the subject is clearly false, and they were willing to go to war to provide sanctuary to Bin Laden. The main worry was that any such delays at this point would give Bin Laden more room to get away (and Bin Laden did escape: all the way to Pakistan).
So if anything, we should have pursued Bin Laden even more vigorously back then. The Taliban were successful in buying enough time for him to hide with their false diplomacy.
We were at least successful in destroying the Al Qaeda training centers in Afghanistan (successfully located, blown up, and dismantled). Maybe these bases will return now that we've left Afghanistan, but we at least rendered them unable to train new terrorists for the last 20 years or so (and the new Taliban regime officially doesn't want to sanction any such training sites anymore. They've got an ISIS-K problem because of it too)