You're not technically wrong, but that's like complaining about the bad gas mileage a semi truck gets when driving it to Starbucks for a coffee. Yes, the gas mileage would be better with your Prius. But no, that's not the real use-case for this thing.

First 3 Falcon launches failed. Now Falcon launches at an annualized rate of roughly 100 times per year and is the most reliable launch vehicle ever made in terms of numbers of consecutive successful launches. Let’s see how Starship’s 4th launch goes.

This is quite the pessimistic take. If you could wave the old magic wand, what would you do? I feel like you'd start by shutting down the Starship program completely and putting the money/effort elsewhere.

A SLS launch costs about 2 billion dollars. A Starship launch is estimated to cost around 40 million. It'll probably end up costing more than that, but it would need to cost a whole lot more to make the SLS a better option