That’s exactly correct. Reserve fuel, whether it’s alternate, holding, weather, contingency etc is there to be used. If that need arises..it only has to be exactly correct on departure ..what if a plane has lost a wheel on the runway at your destination and the tower advises it will take 15-20 minutes to get a tug to tow it clear...and your alternate if required is 35 minutes away..are you required to divert immediately in case or wait 20 minutes..what if after 20 minutes they say we just need 10 minutes to do a runway inspection..and now you don’t have enough fuel for your alternate plus legal reserve..have you done anything wrong?