As long as you can copy and paste Python code to Mojo and it is 1:1 compatible with all your existing libraries and is hundreds of times faster than Python, that is much better than wasting time rewriting it in another language that is 8x faster than Mojo (in its first release) with hand-optimizations from Julia language experts.
I expect Mojo's first release to be fast enough that it would get the Python folks using it over Julia and that the next Mojo release or future ones will get another 8x or 10x faster.
The same outcome happened with Bun 1.0 and already claimed the top spot in speed and compatibility in the node ecosystem in its first release and it isn't even done yet.
The least amount of effort to get something done much faster wins by default.
It's only closed-source for now, with plans to open-source the language when it's more finalized - similar to LLVM early on. Not sure if it says so explicitly on their website somewhere, but Chris Lattner has stated that several times
This is not how you think Mojo works.
If you copy&paste python code into Mojo, you will not benefit from optimizations. You need to refactor your python code into Mojo code to gain compiler efficiency.
But if you look at the refactored code in the end, it is very ugly syntax (this is my personal opinion and might change with the evolution of Mojo)
Please actually read the Mojo code. It is full of complex hand-optimized simd instructions.
By comparison, the simd-optimized Julia code (especially the first version) is significantly more elegant and transparent.
Impressively, the ComplexSIMD Julia class was defined in a few simple lines, from scratch. I wonder what the, apparently built-in, complex simd functionality in Mojo looks like under the hood.
I expect Mojo's first release to be fast enough that it would get the Python folks using it over Julia and that the next Mojo release or future ones will get another 8x or 10x faster.
The same outcome happened with Bun 1.0 and already claimed the top spot in speed and compatibility in the node ecosystem in its first release and it isn't even done yet.
The least amount of effort to get something done much faster wins by default.