The reusability of the Falcon 9 is something still something without a lot of public information. I'd love to know how much they're spending to refurbish each of these – is it 80% of build cost or 20%? Are they decommissioning other rockets earlier than 16 launches because they're finding faults, or are most just waiting for more launches? What are the decisions to re-fly based on, are there common failure modes that aren't causing mission or recovery failures but are causing SpaceX to rule out the booster for future missions.

We do know that they're turning around boosters for re-use in less than 30 days which suggests they aren't doing extensive work, although I don't know how long building a new booster takes so maybe this is most of the time anyway.

Maybe none of these details really matter with Starship on the way, in the long term that will probably address all of these much more obviously, but it's still a way off and for now the F9 is the core of their business.