> Second, Starship is much more expensive for each launch attempt than Falcon 9 ever was

They are already reusing boosters, so it might already be cheaper than F9 before booster reuse. Once they start reusing the ships, it will be cheaper than F9 with booster reuse because F9 has to build a new second stage each launch.

> Fifth, the market for Starship is unproven

The market for Starship is proven by SpaceX itself. The Starship can add 20x the Starlink network capacity per launch as F9. There are currently around 100 Starlink launches per year, so the market couldn't be more proven.