Falcon was a rocket designed by real rocket scientists and experts in their field
Same with starship.
Back then Elon actually listened to them. But for Starship he began to believe that he was competent enough in rocket science to make those calls and ignored anyone telling him otherwise.
And you base this on...?
That's why it's such a mess, had multiple redesigns and can't really get anywhere.
How many rockets can you list that haven't had multiple iterations in the design before even making it to prototype? Falcon 9 certainly did. The merlin engine certainly did. Your username is quite appropriate, by the way.
First it was supposed to be carbon fiber (nod to OceanGate) but that turned out to be shit
Nobody tried to build starship out of carbon fiber. See if you can figure out what that means. I'll give you a few years.
Also, you likely have it in your head that subs can't be built out of carbon fiber and actually work well, and you, just like James Cameron, are quite wrong on this. It's actually been done, successfully, many times, well before oceangate even existed, not only by the US navy, but by the private sector as well.
https://www.designnews.com/ind...
The fact that it was carbon fiber isn't even why the Titan ultimately imploded. Many things lead up to that, but if you actually look at the way that it imploded, the carbon fiber hull didn't initially buckle, and that was despite how very poorly they built it. The most likely cause was the mismatch of the modulus between the titanium cap and the carbon fiber hull, which eventually caused them to separate. That was made worse by the fact that they allowed it to freeze, and they never properly transported it, even opting to lift it in ways that would cause unnecessary stress to the caps. This is all evidenced by the fact that the glue holding the caps and the hull together appears to have separated cleanly in many spots. Even further evidenced by the fact that the outer wall of the titanium channel sheared right off. Everything that happened afterwards, including the hull shattering, was a domino effect resulting from that.
The problem with oceangate wasn't their choice of materials. The problem with oceangate is that their mindset is remarkably similar to yours: They felt it was a good idea to go to production with the first iteration of their design, and without doing any destructive testing to even determine what the limits are.
It's worth mentioning, by the way, that every starship flight thus far has pushed the vehicle well beyond its intended limits, and in more ways than one. For example, you might have noticed that every launch has been missing some tiles -- this is, in fact, deliberate. As you've already demonstrated that you're not aware, it's a good idea to design, test, and iterate, changing things where appropriate.
Not to mention having to use tiles that was a huge problem and cost related to Space Shuttle.
No, that wasn't at all why the shuttle was expensive. There are a lot of reasons for that, mainly surrounding the sheer complexity of it and that it wasn't as reusable as NASA thought it would be. As you're no doubt not aware, heat tiles themselves aren't all that expensive. Well...except in the case of the space shuttle, where each one was made to order, as many (most?) had to be placed in a particular position. Starship doesn't have that problem, and even better, they're all made in-house. That latter bit is a huge reason why SpaceX can bring the cost down as much as it does -- most of the cost around rocketry is because there are very few players in the industry who actually make any parts, and they charge an arm and a leg for basically everything, precisely because the industry has had a long history of using cost plus contracts, where the government foots the bill of everything, and the manufacturer is guaranteed at least so much profit, no matter how expensive their suppliers are.
SpaceX, on the other hand, has never used a cost plus contract. Not even once. Elon's mindset is very much that of "That costs how much? screw that, let's make it ourselves for a fraction of that cost." And you know what? Not only does it work, it's also proven. This was literally the same thing that was done with falcon 9, by the way.