Because perhaps not everyone believes that is the case. If you believe that you should be calling on us to trade all of our upcoming free agents and veterans
Again, there is no guarantee if you trade for a guy it's just a half year thing so I'm not sure why you are assuming that without even knowing who may be available. You need to see who is available before you know the cost from a draft pick and salary cap perspective. It is often a veteran player like a Davante Adams that becomes available and who would in theory remain on the team that trades for him for a few years