The 20 launches includes backup missions. The actual number of launches they need is in the teens. Spacex has averaged a launch every 4 days this year. That he

The 20 launches includes backup missions. The actual number of launches they need is in the teens. Spacex has averaged a launch every 4 days this year. That heavy launches are infrequent is due to the limited demand. To meet this cadence, they'ed need to average one launch per launch pad every 12 days. If they fail to meet that cadence, it just means a little more propellant boils off, which can still be topped off with one of the backup launches. I would not describe something currently going through flight tests as a fantasy rocket. At the time of this comment it has made it into space (even if just barely). Sure it's not ready to go yet, but it's not just an idea on paper either.